Revert "msm: kgsl: Enable SPTP power collapse"

This reverts commit c3b616ab.
Enabling SPTP PC feature caused instability issue in PDT.
Disable it until it's fixed.

CRs-Fixed: 2052606
Change-Id: I6bb25816e01dbe170197599a169b4c9e4dffb1e4
Signed-off-by: George Shen <sqiao@codeaurora.org>