mm-video-v4l2: venc: Advertise correct output-size for meta-mode

If output allocation is a handle (for secure case of explicitly
configured by the client), return the handle-size and not the
actual buffer-size as the output size

Bug: 34735194
Change-Id: I1ea8cbcbba348cc2e7047f2246968ea1a0b3525a
1 file changed