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: c1ea8f64167270d67915b4d4fb00910b1c0f513f

Signed-off-by: Paul Reioux <reioux@gmail.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>

Conflicts:

	drivers/gpu/msm/kgsl_pwrscale_trustzone.c

Change-Id: I536c242b0696225487cb27288846e825a56ca746
KGSL: make simple govenor a selectable option, co-exist with ondemand

also removed some hardcoded values

Signed-off-by: Paul Reioux <reioux@gmail.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>

Conflicts:
	drivers/gpu/msm/kgsl_pwrscale_trustzone.c

Conflicts:
	drivers/gpu/msm/kgsl_pwrscale_trustzone.c

Change-Id: I01bd3238cfa42dd77c15d799499fe3adef0ff4fd
Merge "KGSL: Add a simple GPU governor for Adreno xxx GPU series" into android-4.4
Merge "KGSL: make simple govenor a selectable option, co-exist with ondemand" into android-4.4