ARM: dts: msm: add DTBO support for MSM8996pro CDP board

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

Change-Id: Ied6555fbe9451ab64cc53425f77fc68dd7167ee1
Signed-off-by: Firoz Khan <firozk@codeaurora.org>