GPU overclock support

Change-Id: I03d131eebcd03ff6a0a41c2f5a097a6c0af5befb

Conflicts:
	arch/arm/configs/cyanogenmod_quincyatt_defconfig
	arch/arm/configs/cyanogenmod_quincytmo_defconfig
	drivers/gpu/msm/kgsl_pwrctrl.c