ARM: dts: msm: add spcom to sm8150

Add Secure Processor Communication (spcom) device tree info.
This spcom driver supports communication with secure processor
subsystem over glink transport layer.

Change-Id: I87146c36332581a7d86c468345aa5c4755c3c6bc
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>