baords/arduino-due: use shared files

boards/arduino-due/Makefile

boards/arduino-due/Makefile.dep

boards/arduino-due/Makefile.features

boards/arduino-due/Makefile.include

boards/arduino-due/board.c

boards/arduino-due/doc.txt

boards/arduino-due/include/arduino_board.h

boards/arduino-due/include/arduino_pinmap.h

boards/arduino-due/include/board.h

boards/arduino-due/include/gpio_params.h

boards/arduino-due/include/periph_conf.h

boards/arduino-due/include/sdcard_spi_params.h

boards/arduino-due/include/w5100_params.h