defconfig: msm8916: Activate System Monitor communication

The System Monitor driver allows a subsystem to be notified
about events on other subsystems, such as 'powering up' or
'shutting down'. Activate this feature for the 8916.

Change-Id: I788f6183933e595f1d0fa7e9de6f0da682127a90
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>