msm: kgsl: Move hardware clock gating tables to the GPU description

Instead of spreading the hardware clock gating tables all over the
code, move them to the master GPU list. This helps to reduce the
number of different locations in the code that need to be updated
for new targets.

Change-Id: Ic0dedbad267db453d68b5166df1a083cc5916999
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>