boards/nucleo: move shared code to common/nucleo

boards/common/nucleo/Makefile

boards/common/nucleo/Makefile.dep

boards/common/nucleo/Makefile.features

boards/common/nucleo/Makefile.include

boards/common/nucleo/Makefile.include.serial

boards/common/nucleo/dist/openocd-f0.cfg

boards/common/nucleo/dist/openocd-f1.cfg

boards/common/nucleo/dist/openocd-f2.cfg

boards/common/nucleo/dist/openocd-f3.cfg

boards/common/nucleo/dist/openocd-f4.cfg

boards/common/nucleo/dist/openocd-f7.cfg

boards/common/nucleo/dist/openocd-l0.cfg

boards/common/nucleo/dist/openocd-l1.cfg

boards/common/nucleo/dist/openocd-l4.cfg

boards/common/nucleo/include/arduino_board.h

boards/common/nucleo/include/arduino_pinmap.h

boards/common/nucleo/include/board_common.h

boards/common/nucleo/include/gpio_params.h

boards/nucleo-f030/Makefile.dep

boards/nucleo-f030/Makefile.features