msm: mdss: Fix PA memory color read sequence for foliage HOLD values

The memory color values for the left and right hold of foliage were
incorrectly returning the values for sky. This change fixes the foliage
hold values that will be returned during read.

CRs-Fixed: 968059
Change-Id: Ib5c2ae9b8fbe8817d730104ace88f20f04b59d17
Signed-off-by: Benet Clark <benetc@codeaurora.org>