ARM: dts: msm: add DTBO support for APQ ADP board

Add device tree blob for overlay support for APQ ADP board.
Divide the initial device tree files into main and overlay
device tree based on soc and board specific information.

Change-Id: I94c7b0c5a906fafecf8fb771f21e9f68d53a38e8
Signed-off-by: Firoz Khan <firozk@codeaurora.org>