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 for the latest Adreno
drivers

Signed-off-by: faux123 <reioux@gmail.com>

Conflicts:

drivers/gpu/msm/Kconfig
 drivers/gpu/msm/kgsl_pwrscale_trustzone.c

idea
is taken here -
https://github.com/rmbq/android_kernel_htc_msm8960/commit/443d5cff970ca8436d2a0e2665fc1065856d4089