msm: mdss: Upgrade and fix AD implementation

Clean up the ad lock and bl_lock to avoid potential deadlock, and
remove no longer needed code for assertive display, including extra
AD parameter setup triggered by backlight change, auto backlight mode
support. Also change the AD backlight linearization LUT from 8 bit to
12 bit values and upgrade the mapping from point to point mapping to
piecewise linear mapping.

Change-Id: Iac4e3de0f96f24ece4220dc740d781324265ffa8
Signed-off-by: Ping Li <quicpingli@codeaurora.org>