ARM: dts: msm8916: Add rpm master stats support

Rpm master stats would allow user to read the
different master low power mode stats for a given SOC.
Add support rpm master stats for 8916.

The below is sample output.
cat /d/rpm_master_stats
APSS
	shutdown_req:0x0
	wakeup_ind:0x0
	bringup_req:0x0
	bringup_ack:0x0
	last_sleep_transition_duration:0x0
	last_wake_transition_duration:0x0
	wakeup_reason:0x0
	numshutdowns:0x0
	active_cores:0x1
	core0
MPSS
	shutdown_req:0x0
	wakeup_ind:0x0
	bringup_req:0x0
	bringup_ack:0x0
	last_sleep_transition_duration:0x0
	last_wake_transition_duration:0x0
	wakeup_reason:0x0
	numshutdowns:0x0
	active_cores:0x1
	core0
PRONTO
	shutdown_req:0x0
	wakeup_ind:0x0
	bringup_req:0x0
	bringup_ack:0x0
	last_sleep_transition_duration:0x0
	last_wake_transition_duration:0x0
	wakeup_reason:0x0
	numshutdowns:0x0
	active_cores:0x1
	core0

Change-Id: I05820275714aaf014770af4c37bf6cd4db792d0d
Signed-off-by: Anji Jonnala <anjir@codeaurora.org>