boards: nrf51_pca10028: Add button and LED definitions

For the basic samples to work, button and LED definitions are required
in board.h. These map the buttons and LEDs present on the board to the
corresponding GPIOs they are wired into.

Change-Id: I60903eb834ef1b2618b0525896c120fca84db177
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
1 file changed