KGSL: Add a simple GPU governor for Adreno xxx GPU series

initial coding for a Simple GPU governor based on my own work 2 years ago
from Sensation GB kernel commit: c1ea8f6

Signed-off-by: Paul Reioux <reioux@gmail.com>

	modified:   arch/arm/configs/cm_fusion3_yuga_defconfig
	modified:   drivers/gpu/msm/Kconfig
	modified:   drivers/gpu/msm/kgsl_pwrscale.c