video: msm: Allow Enabling of DMA P Hist LUT

Histogram LUT enabling was accidentally disabled by a previous patch. This
patch allows it to be enabled again, while not conflicting with the patch
that previously disabled it.

CRs-Fixed: 336128
Change-Id: I5106999d79b5fdee255e23d31e5bc7de5d59b937
Signed-off-by: Carl Vanderlip <carlv@codeaurora.org>