msm: sde: clean up evtlog & trace for inline rotator

Clean up evtlog messages for inline commit and inline
start. Route evtlog to trace log so rotator events can
be correlated with DRM events.

Change-Id: I3439540f0f54dffa3c0687e32fb1bfd740cb0eaa
Signed-off-by: Alan Kwong <akwong@codeaurora.org>