msm: kgsl: set active pwrlevel to init pwrlevel after power collapse

Between kgsl_open and kgsl_release calls active pwrlevel could be
set to anything based on the content. However after a power collapse
always power up the GPU and set the clock to init level.

Change-Id: Ic2858218afa9c1047864ab8551b3495b7d752952
Signed-off-by: Suman Tatiraju <sumant@codeaurora.org>