msm: mdss: Add changes for PP PA v2 functionality

The new version of PA in postproc has added functionality in DSPP and VIG.
This change adds functions for handling the reading and writing of these
new registers, as well as PA v2 setup in DSPP and VIG setups. This change
only adds functionality for global adjustment and memory color adjustment.

Change-Id: Iab1644714928055f15cf496185509b1712d0ceae
Signed-off-by: Benet Clark <benetc@codeaurora.org>