msm: kgsl: Don't reregister msm policy every time we switch policies
msm: kgsl: Don't reregister msm policy every time we switch policies

DCVS only expects a core to be registered once and kgsl reregisters
the core every time the policy changes. Kgsl should only do the
sink start and stop every time and only do the register the first time.

Change-Id: Id54f078d6013586899bf85fc2462e6c473ffc6b5
Signed-off-by: Suman Tatiraju <3cf0f186520a9ded19b3ad376b389fe60b55f4ed@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas