drm/msm/sde: add separate handling for rsc states

Handling of  rsc states are different in rsc version 3
and rsc version 2. Add separate handling for switching
between different states for both the versions.

Change-Id: I383dea62fbd5ea840641c6a9e764bcb91c8fcb75
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>