kgsl: gpu: update max power levels
kgsl: gpu: fix 3D frequency scaling

Existing logic had redundant code and wasn't exactly
efficient in scaling the governor.  Removed unnecessary
logic and cleaned it up a bit.

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

Conflicts:
	drivers/gpu/msm/kgsl_pwrctrl.c