msm: kgsl: Ensure glitch free changing of the GPU frequency

If there are requests to skip levels while the clocks are on
be sure to hit the intermediate frequencies.

Change-Id: Ib69bcbc7eb87532c090b4ede28d967e4cd0f08ec
Signed-off-by: Lucille Sylvester <lsylvest@codeaurora.org>