media: video: Allow NR threshold to be updated by motion est

VCAP did not allow for client to update threshold values based
on the motion estimation. By enabling an option for this threshold
to be updated dynamically by hardware, this allows for a more
aggressive noise reduction to be applied at the request of the
client.

Change-Id: I0ac590ef826ce4567c048745efafbeb05011f31e
Signed-off-by: Terence Hampson <thampson@codeaurora.org>