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

Add default SWO pin number and config if not defined in Ambiq target

Enable ITM (SWO) tracing support to Ambiq Apollo3 targets

add ITM (SWO) tracing support to Ambiq Apollo3 targets

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.

Update UART pin names & add MBED_CONF_TARGET_STDIO_UART overrides

Add standard pin-names validation script & tests

Add extern "C" around am_hal_secure_ota.h functions

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.

Apollo3: Fix run time error due to memory mapping ...

The Appollo3 targets require dummy sections in stack and heap regions.
The stack dummy section does not contain any symbols. It is only used
for the linker to calculate the size of the stack sections and assign
values to stack symbols later.
The heap dummy region is used to identify the beginning of available dynamic memory.

CMake Ambiq Micro: fix CMakeLists names

CMake Ambiq Micro: fix years

CMake Ambiq Micro: fix naming

Ambiq Micro: refactor CMake targets ...

Follow what we did for ST, to create separate CMake targets for each Mbed target.

Apollo3: Fix heap size formula and stack start address in scatter file ...

The heapsize 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.

The stack start address should be the top of the RAM which is also fixed.

update startup gcc to add back weak definitions and have HciDrvRadioBoot call NVIC_SetVector

Ambiq_Micro: 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
#13474 for more information.

CMake: Add support Ambiq targets

Merge pull request #13861 from idea--list/ambiq-apollo3-dev-squash ...

Ambiq apollo3 fix of an SPI related SD bug

Update sleep.c ...

copyright date change

added naieve way of sleeping seems to work at first glance

Update spi_api.c ...

Modified the spi_master_block_write() function yet again. SD related examples still read/erase/write the SD cards as expected and with these alterations the power consumption does not remain high after the SPI transaction has been finished. However i still only tested the SD functionality. Please test other SPI scenarios and different sensors as well to find out if this PR introduces unexpected bugs or not.

Changes:
- deleted the whole if (xfer.ui32NumBytes) condition as i did not find it logical (by that i mean xfer.ui32NumBytes was also true within the following else if (tx_length != rx_length){} block, so basically when the 2 buffers had different lengths an extra transfer has been done for nothing)
- removed the bool Rw = (rx_length >= tx_length) as the comparison >= has no sense anymore after if (tx_length == rx_length) on line 159.

Update spi_api.c ...

Modified line 145:  previously the fill character has been hard coded to 0x00. However in Mbed OS core SPI_FILL_CHAR is defined in the core to be 0xFF by default (one can change that through mbed_app.json for example). This mod allows us to use the same fill character that is defined for Mbed OS.

Also modified spi_master_block_write(): previously it called am_hal_iom_blocking_transfer on line 182, but that prevented succesful SD card writing operations. Now i changed that part to am_hal_iom_spi_blocking_fullduplex and SD functionality seems to be working.

Apollo3 and artemis, remove dead code and include relevant header

Apollo3 and artemis code review changes, remvoe dead code, add missing spdx identifiers, fix style

Add new targets, Ambiq Apollo3 and Sparkfun Electronics, SFE, boards