Deleted mcu spec from board.h - will be defined by compiler
Deleted mcu spec from board.h - will be defined by compiler

Signed-off-by: malo <bf7cdc72adfdcf4153c1572af5b7953bc9e9c4c6@25cmsquare.io>

malosek/RIOT,malosek/RIOT,malosek/RIOT,malosek/RIOT,malosek/RIOT,malosek/RIOT