video-chroma: Add support for any combination of chroma-site flags
We've been allowing only a few known chroma-site values such as jpeg (not co-sited), mpeg2 (horizontally co-sited) and dv (co-sited on alternate lines). That's insufficient for representing all possible chroma-site values. By this commit, we can represent any combination of chroma-site flags. But, an exception here is that any combination with GST_VIDEO_CHROMA_SITE_NONE will be considered as invalid value.