Revert 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

Change-Id: I18f70d8dd85cecc8ea4643633207cfbff46d03ae
Signed-off-by: Paul Reioux <reioux@gmail.com> (reverted from commit 954ad86131f9c18657733ec91e97cbea370ad26a)