soc: qcom: smp2p: Add support for sensor subsystem

The sensor subsystem now supports SMP2P communication, so add the necessary
support to allow the apps subsystem to talk to the sensor subsystem.

Change-Id: I8f7fc1c710661b4bd8b5f33052321e67dc83f335
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>