msm: sde: avoid commit kickoff if no inline start

Avoid triggering the rotator kickoff unless the 'start'
notification has been received for inline rotation use
cases. This prevents the rotator hardware from waiting
for, and timing out on, a hardware start event that
never triggers due to the DRM driver aborting the commit
cycle.

Change-Id: If11268795280ca6f7de331fe942e7eb4f5fdc2eb
Signed-off-by: Clarence Ip <cip@codeaurora.org>