Revert "Revert "video: msm: Always queue histogram work""

This reverts commit 2423ba8a.
commit 2423ba8a... will be refered to as commit X

Commit X should have been listed as a parent of commit
56a123ba (i.e. video: msm: Always queue
histogram work & lock histogram calls).

commit 56a123ba... will be refered to as commit Y

Commit Y is composed of 3 commits that were squashed together after they
caused errors when only one of them merged into mainline. Commit X was
created to revert the first of these 3 commits, and thus resolve the
errors.

However, when updating commit Y, commit X was omitted as the parent commit.
So when commit Y merged as a parent of commit X, commit X reverted part of
commit Y. By reverting commit X, this commit restores commit Y.

Change-Id: Ibfad464a2579354c92bc62d406672dcfc6a24009
Signed-off-by: Carl Vanderlip <carlv@codeaurora.org>