drm/msm/sde: Add AHB based programming support for igc feature

Change adds the AHB based igc feature programming support to
color processing module present in CRTC.

Change-Id: Id4865f6f312b2ed72849db2ba5268a7858d6c76b
Signed-off-by: Rajesh Yadav <ryadav@codeaurora.org>