dlx: Disable denoise setting for camera

Enabling denoise causes camera to crash. Report that only "off" is
supported so that Camera2 removes the setting.

Change-Id: I6caab1d78cf24cc3b1b2faaa8a9d1b3d4c6e7715
(cherry picked from commit caf90f6c9f71f26d1f575d10a92ddf1d87b24b1e)