CMake STM32: fix targets naming ...

Follow the naming for other CMake targets, using prefix mbed-, lower case with dashes

cmake: Refactor ST targets ...

Refactor all ST targets to be CMake buildsystem targets. This removes
the need for checking MBED_TARGET_LABELS repeatedly and allows us to be
more flexible in the way we include MBED_TARGET source in the build.

A side effect of this is it will allow us to support custom targets
without breaking the build for 'standard' targets, as we use CMake's
standard mechanism for adding build rules to the build system, rather
than implementing our own layer of logic to exclude files not needed for
the target being built. Using this approach, if an MBED_TARGET is not
linked to using `target_link_libraries` its source files will not be
added to the build. This means custom target source can be added to the
user's application CMakeLists.txt without polluting the build system
when trying to compile for a standard MBED_TARGET.

STM: fix ARMClang sct files, using proper -E command ...

This is required for ARMClang, otherwise there is an error with unknown command.

CMake: add STM32L0 targets

STM32L0: STM32Cube_FW_L0_V1.11.3 ...

https://github.com/STMicroelectronics/STM32CubeL0

STM32L0: directory restructuration ...

+ STM32Cube_FW_L0_V1.10.0 original files
+ targets.json update introducing subfamily level

Add SPDX license identifier to Arm files ...

Add license identifier to files which Arm owns the copyright to,
and contain either BSD-3 or Apache-2.0 licenses. This is to address
license errors raised by scancode analysis.

stack: armc: Workaround config passing bug ...

Workaround a bug where the boot stack size configuration option is not
passed on to armlink, the Arm Compiler's linker. Prefer
MBED_CONF_TARGET_BOOT_STACK_SIZE if present, as this is what the
configuration system should provide. Fall back to MBED_BOOT_STACK_SIZE
if MBED_CONF_TARGET_BOOT_STACK_SIZE is not defined, as in the case of
buggy tools. If both MBED_CONF_TARGET_BOOT_STACK_SIZE and
MBED_BOOT_STACK_SIZE are not defined, then we fall back to a hard-coded
value provided by the linkerscript. See
https://github.com/ARMmbed/mbed-os/issues/13474 for more information.

Use boot stack size from config system ...

To allow overriding of the boot stack size from the Mbed configuration
system, consistently use MBED_CONF_TARGET_BOOT_STACK_SIZE rather than
MBED_BOOT_STACK_SIZE.

Fixes #10319

STM32 rename TOOLCHAIN_ARM_STD into TOOLCHAIN_ARM

STM32 remove all TOOLCHAIN_ARM_MICRO

STM32L0 code cleaning

Merge pull request #11675 from jeromecoutant/PR_USB_STEP1 ...

STM32 USB update step 1

Clean up ARM toolchain heap+stack setup in targets ...

ARM Compiler 6.13 testing revealed linker errors pointing out
conflicting use of `__user_setup_stackheap` and
`__user_initial_stackheap` in some targets. Remove the unwanted
`__user_initial_stackheap` from the targets - the setup is
centralised in the common platform code.

Looking into this, a number of other issues were highlighted

* Almost all targets had `__initial_sp` hardcoded in assembler,
  rather than getting it from the scatter file. This was behind
  issue #11313. Fix this generally.
* A few targets' `__initial_sp` values did not match the scatter
  file layout, in some cases meaning they were overlapping heap
  space. They now all use the area reserved in the scatter file.
  If any problems are seen, then there is an error in the
  scatter file.
* A number of targets were reserving unneeded space for heap and
  stack in their startup assembler, on top of the space reserved in
  the scatter file, so wasting a few K. A couple were using that
  space for the stack, rather than the space in the scatter file.

To clarify expected behaviour:

* Each scatter file contains empty regions `ARM_LIB_HEAP` and
  `ARM_LIB_STACK` to reserve space. `ARM_LIB_STACK` is sized
  by the macro `MBED_BOOT_STACK_SIZE`, which is set by the tools.
  `ARM_LIB_HEAP` is generally the space left over after static
  RAM and stack.
* The address of the end of `ARM_LIB_STACK` is written into the
  vector table and on reset the CPU sets MSP to that address.
* The common platform code in Mbed OS provides `__user_setup_stackheap`
  for the ARM library. The ARM library calls this during startup, and
  it calls `__mbed_user_setup_stackheap`.
* The default weak definition of `__mbed_user_setup_stackheap` does not
  modify SP, so we remain on the boot stack, and the heap is set to
  the region described by `ARM_LIB_HEAP`. If `ARM_LIB_HEAP` doesn't
  exist, then the heap is the space from the end of the used data in
  `RW_IRAM1` to the start of `ARM_LIB_STACK`.
* Targets can override `__mbed_user_setup_stackheap` if they want.
  Currently only Renesas (ARMv7-A class) devices do.
* If microlib is in use, then it doesn't call `__user_setup_stackheap`.
  Instead it just finds and uses `ARM_LIB_STACK` and `ARM_LIB_HEAP`
  itself.

STM32L0 USB pins addition

TARGET_STM: Add DEVICE_SPI_COUNT to use SPIs without interference ...

Extend to all STM targets the work done on PR10752.

Signed-off-by: Vincent Veron <vincent.veron@st.com>

STM32: common cmsis.h and device.h

Guard RAM start and size defines

Target_STM: Add ARM_LIB_STACK and ARM_LIB_HEAP section ...

Instead of user defined symbols in assembly files or C files,
use linker scripts to add heap and stack - this is inconsistent
with ARM std linker scripts

Target_STM:_sbrk updated to use limits from linker files no need to set defines ...

_sbrk uses the exports from linker file __end and __HeapLimit to allocate memory
in heap. Linker scripts were updated accordingly to set the limits.

[STM] Support boot stack size configuration option

[ST]: Fix alignment of execute region to 8-byte boundary in ARM linker files ...

--legacyalign, --no_legacyalign are deprecated from ARMC6 compiler, in order to
remove deprecated flags all linker files should strictly align to 8-byte boundary

STM32L0 assert in SetSysClock replaced

stm32 ticker: typo corrections

stm32 ticker: change license

stm32 ticker: rename hal_tick.h in us_ticker_data.h

stm32 ticker: rename macro and update ST HAL Tick functions ...

- rename TIM_MST_16BIT in TIM_MST_BIT_WIDTH in order to use it directly in ticker info structure
- change HAL_InitTick() and HAL_GetTick()

TARGET_STM32L0 astyle

Remove HAL_TICK_DELAY (no more used)

STM32 PeripheralPins.c second update after review ...

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