ARM: dts: msm: Add MSM8992 support

Add the device tree files needed to describe the hardware
on the MSM8992 Sim and Rumi platforms.

Change-Id: I38411eb1e4475e2663a43c1f07663640b5071e15
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>