Work on fixing Issue#17: Declare SoC and board-specific defines in Makefile
Work on fixing Issue#17: Declare SoC and board-specific defines in Makefile

-- Added NRF52840_XXAA and BOARD_PCA10056 to example Makefile.

openweave/openweave-nrf52840-lock-example,openweave/openweave-nrf52840-lock-example,openweave/openweave-nrf52840-lock-example