Convert over NRF based boards to use device tree instead of board.h to
describe buttons & LEDs. There are a few boards that the button gpio
flags need validation.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
A new board configuration is added for Thingy:52, also known as
PCA20020. This includes support for some of the on-board sensors, and
other peripherals such as the on-board GPIO expander.
The board power rail sequencing is also implemented, as the rails need
to be powered up in a correct order and before certain device driver
init calls are made.
Signed-off-by: Aapo Vienamo <aapo.vienamo@iki.fi>
Kumar Gala