video: msm: Maintain histogram LUT state through suspend resume

Make sure LUT state is maintained after suspend resume. Required to
ensure
HistLUT and backlight scale are in sync.

CRs-Fixed: 476491
Change-Id: Icc999aa0b04cad93ceed334426f61b71cbdd0a13
Signed-off-by: Carl Vanderlip <carlv@codeaurora.org>
Signed-off-by: Mekala Natarajan <mekalan@codeaurora.org>
Signed-off-by: flar2 <asegaert@gmail.com>

idea is taken here -
https://github.com/flar2/m7-Sense/commit/04777de1f8f284465b7e2a89dea0516b00573faf