makefile: use -Wno-error= cflag
Power: Merge the power driver from CM OPO kernel

People were having charging issues (percentage not updating while charging charging indicator light not shutting off after unplugging) this merge fixes them

Change-Id: I269e621c55213d03489dbeb3cd5dee012174aa0f

Conflicts:
	drivers/power/Kconfig
	drivers/power/bq24196-charger.c
	drivers/power/bq27541_fuelgauger.c
	drivers/power/pic16F1503_fastcg.c
	drivers/power/qpnp-charger.c
	include/linux/qpnp-charger.h
Merge Headset Controls from OPO
fixes oppo's headset controls that were not functioning