GPU Simple Governor: adapt GPU Simple Governor for Snapdrgaon 800 SOCs

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>
Signed-off-by: engstk <eng.stk@sapo.pt>

Conflicts:
	drivers/gpu/msm/kgsl_pwrscale_trustzone.c

Signed-off-by: engstk <eng.stk@sapo.pt>
Simple GPU governor: fix a merge derp

Signed-off-by: Paul Reioux <reioux@gmail.com>
Signed-off-by: engstk <eng.stk@sapo.pt>
Enable GPU Simple Governor