Backport of "video: fix AV12 format lacking the GST_VIDEO_FORMAT_FLAG_ALPHA flag." into 1.24
Backport of !8067 (merged) "video: fix AV12 format lacking the GST_VIDEO_FORMAT_FLAG_ALPHA flag.".
Commits:
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acc1309c
video: fix AV12 format lacking the GST_VIDEO_FORMAT_FLAG_ALPHA flag