Merge pull request #8862 from aabadie/pr/periph/eeprom

cpu/atmega1281/include/cpu_conf.h

cpu/atmega1284p/include/cpu_conf.h

cpu/atmega2560/include/cpu_conf.h

cpu/atmega256rfr2/include/cpu_conf.h

cpu/atmega328p/include/cpu_conf.h

cpu/atmega_common/Makefile.features

cpu/atmega_common/periph/eeprom.c

cpu/stm32_common/Makefile.include

cpu/stm32_common/periph/eeprom.c

cpu/stm32_common/periph/flash_common.c

cpu/stm32_common/periph/flashpage.c

cpu/stm32f0/Makefile.features

cpu/stm32f1/Makefile.features

cpu/stm32l0/Makefile.features

cpu/stm32l0/include/cpu_conf.h

cpu/stm32l1/Makefile.features

cpu/stm32l1/include/cpu_conf.h

drivers/include/periph/eeprom.h

drivers/periph_common/eeprom.c

tests/periph_eeprom/Makefile