Add memory map for stm32f401xe
Add memory map for stm32f401xe

Trying to load a elf image on a stm32f401xe can result in a problem
of flash write if a section does not start on a flash sector because
the memory map given to gdb was wrong.

gtalusan/stlink,gtalusan/stlink,simonjwright/stlink,simonjwright/stlink