drm: msm: Update and correct AD setting for suspend/resume

Mark AD active property to dirty in suspend case so that
those AD properties can be re-programed after device resumes.
This change also corrects the code for AD interrupt and
customer event handling.

Change-Id: Iecf1a6ea8def5bd169e8ad040f8320176eed6904
Signed-off-by: Ping Li <pingli@codeaurora.org>