Revert "msm: kgsl: Update GPU PDC initialization"

This reverts commit c19bddb0.
The reverted change caused CX rail power regression, because
GPU voted a higher CX power level after it exits SLUMBER state.

Change-Id: I595e6c531f45f8f184d28a7ec9ac10e97287826e
Signed-off-by: George Shen <sqiao@codeaurora.org>