boards/arm/stm32/b-g474e-dpow1/scripts/ld.script.dfu:
* New file. Reserve up to 24KiB at the start of FLASH for a
bootloader.
boards/arm/stm32/b-g474e-dpow1/scripts/Make.defs:
* When building with CONFIG_STM32_DFU, use the new ld.script.dfu
to leave room in FLASH for a bootloader.
boards/arm/stm32/b-g474e-dpow1/README.txt:
* "FLASH Bootloader Support": New section.