isFeatureEnabledForOutput already checks if the mobile flag is enabled,
but it also respects the dtenable=1 override.
Change-Id: I95035281bf301b22c1a9ef4c06ec54cdd0cbc85c
This reverts commit 99b757465a.
Reason for revert: We may never need the 'behind-overlay' setting
and it is untested and probably broken.
Bug: T295816
Change-Id: I9e128862271697ece5241d0e98727174b42f54ff