msm: mdss: Store AD backlight notification function

Store Assertive Display backlight notification function while locked to
prevent race condition where AD is disabled while lock is released,
setting function pointer to NULL.

Change-Id: I7996a29595854ed8e50d0fff663a779c3ccd388f
Signed-off-by: Carl Vanderlip <carlv@codeaurora.org>
msm: mdss: Update screen resolution for Assertive Display

Apply the latest screen resolution to AD hardware so that banding
artifacts are not generated.

Change-Id: I5df8a3de4551c5e45e0e8ff2b21b60549b479788
Signed-off-by: Carl Vanderlip <carlv@codeaurora.org>
Signed-off-by: Ping Li <quicpingli@codeaurora.org>