arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts

Add initial device tree support for Qualcomm MSM8916 SoC and MTP8916
evaluation board.  At the current time we only boot up a single processor.

Signed-off-by: Kumar Gala <galak@codeaurora.org>
Signed-off-by: Olof Johansson <olof@lixom.net>