drm/msm/sde: Enable LUT dma block for pa vlut feature

LUT dma enables axi path for sde register programming. Picture
adjustment block is currently using AHB path for programming which is
slower compared to axi path. Change enables the LUT dma block to use the
AXI path for pa block programming.

Change-Id: Id0d88186a6907b0ed2f15cf2b8690d3a90131e77
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>