mm-video: vdec: fix  mpeg2 interlaced video frame drop

For mpeg2 interlaced video, both the interlaced fields
are part of the same ETB i.e, 1 ETB corresponds to 1 FTB.
so we should not pop out two entries from the ts queue.
With this fix, no frame drops are seen for mpeg2 interlaced
video.

Change-Id: I9dd23df751686ca72b180a299de81934911db77b
CRs-fixed: 507896
1 file changed