msm: kgsl: Bump the GPU frequency for long blocks of processing

If there are several frames of full GPU utilization immediately
bump the frequency to turbo rather than waiting for the DCVS
algorithm to run.

Change-Id: I1215225f8903a8656e8ad92c6c82567b86665933
Signed-off-by: Lucille Sylvester <lsylvest@codeaurora.org>