msm: kgsl: Don't wake core to check if it is idle.

Scenarios which check for idle and inadvertently turn
on the core when it was off happen fairly frequently.
Fixing this at the root rather than continuing to work
around each one.

Change-Id: Ibddd40bf69352733c8d4779272aa08757981d494
Signed-off-by: Lucille Sylvester <lsylvest@codeaurora.org>