msm: kgsl: Add support for SP/TP power collapse

The A430 GPU will have the capability to do internal hw
block gating of the SP/TP.  Make sure the blocks are powered
on initially, then allow CP control of the blocks.  Check that
the blocks are off before considering the hw idle.  Check that
the blocks are on before updating performance counters.

Change-Id: Ibd5aebdd6c95463cd7afe9b65e5a4163df5678f8
Signed-off-by: Lucille Sylvester <lsylvest@codeaurora.org>