[PATCH] msm: mdss: Add backlight attenuation mechanism in AD auto
 strength mode

From: Ping Li <quicpingli@codeaurora.org>
Date: Wed, 22 Jan 2014 16:55:35 -0800

AD backlight attenuation provides the ability to modulate backlight based
on calibration before feeding it to AD core for strength computation.

Change-Id: Iea011807b25882463b1142e17324fa0509007aa4
Signed-off-by: Ping Li <quicpingli@codeaurora.org>