STM32WL : ADDING STM32 SUPPORT ...

Add code concerning all STM32 platforms

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.

Microlib slow division causes HAL_GetTick API performance issue, so optimized HAL_GetTick API to improve performance.

TARGET_STM: Remove timeout on HSEM. ...

With tickless mechanism hsem can be used for quite a long time
(time to set up PLL clock).
Also, if hsem is held to long, then this is not the current core which is faulty,
but probably the other (the one which hold the HSEM)

DISCO_H747I Dualcore support ...

Add 2 targets for DISCO_H747I dualcore:
* DISCO_H747I      -> for CM7 core
* DISCO_H747I_CM4  -> for CM4 core

Current restrictions:
* TICKLESS deactivated
* DeepSleep not supported (DeepSleep wrapped to sleep)

Warning: use of the same IP (example I2C1) by both core at the same time is not prevented,
but is strongly not recommended.
Some Hardware Semaphore are use for common IP, to manage concurrent access by both cores: Flash, GPIO, RCC.

Warning: Drag and drop of binary to DISCO_H747I will flash CM7.
         In order to flash CM4, one can use STM32 CubeProgrammer tool.

STM: optimize us_ticker ...

Provide new optimizations for us_ticker and wait_us.

STM32: protect compilation when DEVICE_USTICKER is disabled

Add implementation of ticker_free() function to CI boards. ...

This PR provides implementation of ticker_free() function for the following boards:
ARCH_PRO
EV_COG_AD3029LZ
EV_COG_AD4050LZ
K22F
K64F
K82F
KW24D
KW41Z
LPC546XX
NRF51_DK
NRF52_DK
NUCLEO_F207ZG
NUCLEO_F401RE
NUCLEO_F429ZI
NUCLEO_F746ZG
REALTEK_RTL8195AM

Add lp/us ticker_free() functions stub. ...

This patch adds only empty stubs of `us_ticker_free()` and `lp_ticker_free()` for all boards where these functions are not implemented.

stm32 ticker: change th eplace where timer init in done, fix overflow issue with 16-bit timer ...

- Move back the 16/32bit timer initialization in HAL_InitTick() and not in us_ticker_init()
- Use ticker_read_us() and us_ticker_read() in HAL_GetTick() to fix potential overflow issue with the 16bit timer

==> These corrections allow timer, rtc, sleep, tick tests to PASS

stm32 ticker: corrections in order to pass tests

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()

stm32 ticker: rename files and move functions ...

- rename hal_tick_common.c in hal_tick_overrides.c
- move 16 and 32bits timer functions in us_ticker.c

save/restore timer registers before/after deepsleep

TARGET_STM astyle

Make us_ticker common between 16 and 32 bits counters