QCamera2/HAL3: Recover offline metabuffers on flush

Flush could be called while jpeg jobs from input reprocessing
are still pending. Recover the metabuffers by adding them
to freelist. This will handle the case of flush call not
followed up with conf_streams

BUG=24644360

Change-Id: I1886bf295331d98d2e89b7c43ea7a0c3406ac396
1 file changed