msm: kgsl: Set VLVL values for GMU and GPU

The GPU and GMU need the VLVL values for their respective
operating levels to set up their frequency tables.
Register these values during probe with the OPP kernel
API. Since we are defining them ourselves, we no longer
need to disable unwanted OPPs in the code.

Change-Id: I1982ce7b55e53b0f368c98212032c67bac2439f0
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>