msm: mdss: add histogram and lut support for 8x10

Histogram control and collection, and look up table
is used by content adaptive backlight algorithm (CABL).
Display driver provides control API for CABL to
start/stop histogram collection.  It also provides
the data API for CABL to collect histogram to analyze
the display content.   After analyzing the histogram,
CABL updates the look up table.

Change-Id: If4777e80d2b58ec0e3c55ee1ec748e281472f503
Signed-off-by: Xiaoming Zhou <zhoux@codeaurora.org>
Signed-off-by: Shivaraj Shetty <shivaraj@codeaurora.org>