msm: kgsl: Remove redundant calls

SLEEP & SLUMBER should both wake at default power level on targets w/
GPU DCVS. Combine the calls to make this possible.

CRs-Fixed: 369927
Change-Id: I386a9ab04850b0beb249b47398ad623f91fbbfda
Signed-off-by: Lucille Sylvester <lsylvest@codeaurora.org>

Conflicts:
	drivers/gpu/msm/kgsl_pwrctrl.c
Added missed file