mm-video: vdec: conditionally revert metadata patch

Only libqdutils from display-caf has qdmetadata. This change only uses
qdmetadata if the current display variant is CAF.

This conditionally reverts the commit "mm-video: vdec: Notify display about the format
of video playback".

Change-Id: I4592228351651cd6d4e88d20258092e39a0eb264