msm: mdss: Add six zone functionality for PP PAv2

Added six zone memory color adjustment for picture adjustment block
in post-processing. This includes the necessary structures, flags,
and register reads and writes in order to program the six zone LUT hardware
block in PA

Change-Id: Idb381077497e2b63399ebeb7051027a46b5dd6e1
Signed-off-by: Benet Clark <benetc@codeaurora.org>