msm: kgsl: Enable SP/TP power collapse

Set the SP/TP bit in pwrctrl flags to enable the feature
for all chips that support it.

Change-Id: Iab7044d6f028eee45e6e36b1fa37d93f8c260c35
Signed-off-by: Suman Tatiraju <sumant@codeaurora.org>