video-anc: Replace GST_VIDEO_CAPTION_TYPE_CEA608_IN_CEA708_RAW with CEA608_S334_1A
CEA608_IN_CEA708_RAW is the same format as CEA708_RAW. It's only difference is that it must contain only CEA608 and a format like this does not exist in practice. In practice every element that handles raw cc_data triplets must check each triplet for their actual content and handle them accordingly.
For CC-only streams a parser could signal the existence of CEA608 and/or CEA708 inside the caps but for metas this can only potentially be signalled via the ALLOCATION query for negotiation purposes.
A separate format for this is not very useful and instead it should be a format qualifier.
CEA608_S334_1A is the format defined by SMPTE S334-1 Annex A and which is used for transferring CEA608 over SDI instead of CEA708 CDP packets.