cpu: Add support for STM32F401xE cpu boards: Add support for Nucleo-f401 boards/nucleo-f401: New line fixes and comment on green led pin board/nucleo-f401: Added LED GPIO board/nucleo-f401: Fixed LED GPIO board/nucleo-f401: Minor fixes
Less clutter inside the cpu/* directories by placing linker scripts under cpu/*/ldscripts/CPUNAME.ld