msm: mdss: Add PP LUT compat framework and IGC compat ioctl

Added the LUT op to the PP compat ioctl. The only LUT based PP feature
supported in this patch is IGC. There are compat copy functions for each
of the LUT and IGC structures, in order to simplify the adding of new
fields to the structures in the future.

Signed-off-by: Benet Clark <benetc@codeaurora.org>
Change-Id: I5dad93afd7b5f9f1b01bc64d6af771630375157b