msm: smsm: Add processor AWAKE signaling
This processor-awake signaling can be used by remote processors to
determine if the Apps processor is asleep and if so, if it wants to send
data to the Apps processor that would trigger a wakeup sequence.

Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>

Conflicts:
	arch/arm/mach-msm/smd.c

Change-Id: Id6f1da8727571070fbfca898745bce9efd461a12