Merge pull request #5365 from haukepetersen/add_periph_rom

boards/airfy-beacon/Makefile.features

boards/iotlab-common/Makefile.features

boards/microbit/Makefile.features

boards/nrf51dongle/Makefile.features

boards/nrf52dk/Makefile.features

boards/nrf6310/Makefile.features

boards/pca10000/Makefile.features

boards/pca10005/Makefile.features

boards/yunjia-nrf51822/Makefile.features

cpu/nrf51/include/cpu_conf.h

cpu/nrf51/include/nrf51.h

cpu/nrf52/include/cpu_conf.h

cpu/nrf52/include/nrf52.h

cpu/nrf5x_common/periph/flashpage.c

cpu/stm32f1/include/cpu_conf.h

cpu/stm32f1/periph/flashpage.c

drivers/include/periph/flashpage.h

drivers/periph_common/flashpage.c

tests/periph_flashpage/Makefile

tests/periph_flashpage/README.md