msm: kgsl: Program clock control registers for A4XX

Progran the clock control registers for A4XX that control
internal clock gating of the GPU core. This programming
is more efficient for saving power since certain clocks internal
to the GPU will be turned off when not in use.

Change-Id: If44a3ee22c31a5e6bb1e65fafcdb58b1de4e0a33
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>