NUCLEO_F412ZG add flash driver and bootloader support

[adustm]

Description

This PR enables the Flash driver and the bootloader for the STM32F412xG devices.

• create flash_data.h for the STM32F412xG device
• move current TARGET_STM32F4/TARGET_STM32F439xI/device/flash_api.c and TARGET_STM32F4/TARGET_STM32F439xI/device/flash_api.c at TARGET_STM32F4/ level.
• Add MBED_APP_START and MBED_APP_SIZE in the scatter files / linker files of every toolchains
• Modify the interrupt vector relocation to use NVIC_FLASH_VECTOR_ADDRESS

Status

READY

Migrations

NO

Steps to test or reproduce

flash tests are OK for every toolchains.
mbed-os-example-bootloader and mbed-os-example-bootloader-blinky are working (tested with ARM toolchain)

[0xc0170]

Please check travis failure : Executing: python tools/build.py -m B96B_F446VE -t GCC_ARM -j 4 -c --silent --dsp /home/travis/build/ARMmbed/mbed-os/targets/TARGET_STM/TARGET_STM32F4/flash_api.c:32:24: fatal error: flash_data.h: No such file or directory #include "flash_data.h"

[adustm]

Please check travis failure

Done, I have move the DEVICE_FLASH define so that other devices can compile (B96B_F446VE for instance)

[0xc0170]

/morph test

[mbed-bot]

Result: SUCCESS

Your command has finished executing! Here's what you wrote!

/morph test

Output

mbed Build Number: 938

All builds and test passed!