boards/nucleo: use shard board.h and board.c files

boards/common/nucleo/Makefile

boards/common/nucleo/board.c

boards/common/nucleo/include/board_nucleo.h

boards/common/nucleo144/include/board.h

boards/common/nucleo32/include/board.h

boards/common/nucleo64/include/arduino_board.h

boards/common/nucleo64/include/arduino_pinmap.h

boards/common/nucleo64/include/board.h

boards/nucleo-f030/Makefile

boards/nucleo-f030/include/board.h

boards/nucleo-f070/Makefile

boards/nucleo-f070/board.c

boards/nucleo-f070/include/board.h

boards/nucleo-f072/Makefile

boards/nucleo-f072/board.c

boards/nucleo-f072/include/board.h

boards/nucleo-f091/Makefile

boards/nucleo-f091/board.c

boards/nucleo-f091/include/board.h

boards/nucleo-f103/Makefile