drm/msm/sde: Fix UBSan warnings in sde

Fix warnings by accessing PGC and IGC c1 and c2 component arrays directly
rather than through offset from color0 component lut address.

Change-Id: I18df6c6a599ab8dc5f69c34c6977e289402e9e4f
CRs-Fixed: 2531780
Signed-off-by: Ashu Sharma <aashu@codeaurora.org>