Remove all source files exclusive to Arm Compiler and IAR (#159) ...

* Remove all source files exclusive to Arm Compiler and IAR

* Also remove 'TOOLCHAIN_ARM'

* Remove targets.json entries for ARM and IAR

GPIO: Use uintptr_t for gpio_irq_api context ...

The HAL gpio_irq_api stores object IDs, which serve as a form of context
for the dispatch of the interrupt handler in the drivers level
InterruptIn Class. The way this is achieved is that the InterruptIn
Class casts its address to uint32_t, which is stored as the ID.
This results in compilation failure when the size of an object pointer
is greater than uint32_t, for example when building on a PC for unit
testing.

In order to allow Unit Testing of the InterruptIn Class, we replace the
use of uint32_t with uintptr_t (type capable of holding a pointer),
which allows portability and expresses intentions more clearly.
In aid of this latter goal, we also replace the use of the name "id"
with "context", to improve clarity - these are addresses of the context
related to that callback.

CAN: Use uintptr_t for can_irq_ids ...

The HAL can_api stores an array of IDs in order to dispatch interrupts
to the correct CAN object. The drivers level CAN Class casts a pointer
to itself to an uint32_t, which is stored as the ID and then cast back
to a CAN * in order to call the correct handler. This results in
compilation failure when the size of an object pointer is greater than
uint32_t, for example when building on a PC for unit testing.

In order to allow Unit Testing of the CAN Class, we replace the use of
uint32_t with uintptr_t (type capable of holding a pointer), which
allows portability and expresses intentions more clearly. In aid of this
latter goal, we also replace the use of the name "id" with "context",
to improve clarity. These are addresses of the context related to that
callback.

Update UART pin names & add MBED_CONF_TARGET_STDIO_UART overrides

Add standard pin-names validation script & tests

Add bare metal support to EFM32 targets ...

Modify scatter files to add heap load region, and remove hard coded
values. Add supported c libs and bare metal profile to `targets.json`
configurations. Affects the following targets: EFM32GG_STK3700,
TB_SENSE_12, and EFM32GG11_STK3701.

Remove uARM dependencies for EFM32FF targets

CMake: Create CMSIS library targets to remove dependency on MBED_TARGET_LABELS ...

This goes towards eventually removing reliance on targets.json to specify
the requirements of Mbed targets.

CMake: Refactor Silicon Laboratories targets ...

Refactor all Silicon Laboratories 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.

EFM32GG: Fix heap size formula in scatter files ...

The heap size was incorrectly calculated.
This fixes it by subtracting the Stack size, any memory chunks allocated
before the start of the application (for vectors and/or crash report), and
finally the size of the application from the total RAM size.

CMake: Add support for SiLabs SL_RAIL

CMake: Add support for SiLabs EFR32MG12 targets

CMake: Add support for SiLabs EFM32GG11 targets

CMake: Add support for SiLabs EFM32GG targets

Merge pull request #13961 from hugueskamba/hk_remove_silabs_rail_EFR32_1 ...

Silabs: Remove EFR32_1 rail files

Workaround to fix RTC-reset issue on the EFM32GG11_STK3701

Silabs: Remove EFR32_1 rail files ...

Mbed OS 6 does not support Silicon Labs EFR32_1 rail

Workaround to fix RTC-reset issue on the EFM32GG11_STK3701

Workaround to fix RTC-reset issue on the EFM32GG11_STK3701

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.

Add license notice to Arm copyrighted source files ...

Scancode found missing license notices in our source files. This commit
addresses those issues by adding an Apache-2.0 notice to source files
highlighted.

Merge pull request #13492 from talorion/fix-PwmOut-resets-after-suspend ...

Fix pwm out resets after suspend

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

fixed order of operations

fixed order of operations

Fix a typo in PeripheralPins.c for EFM32GG11 ...

- PF13 had the same value as PF15

pwmout - EFM32 - add read methods for period and pulsewidth

Remove EFM32PG12 targets

Remove EFR32MG1_BRD4150 target