fourcc: add the color model to the chroma description
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When the vlc_chroma_description_t is going to be read, it's faster to get this information here than having to call vlc_fourcc_IsYUV(). And we have more information here.
Opaque chromas can be YUV, RGB or unknown. They were listed in p_list_YUV.
I checked that all values listed in mapping_video match the result of vlc_fourcc_IsYUV() with this code:
for (size_t i = 0; i < ARRAY_SIZE(mapping_video); i++)
{
const struct fourcc_mapping *entry = &mapping_video[i];
const vlc_chroma_description_t *desc = vlc_fourcc_GetChromaDescription(entry->fourcc);
const bool is_yuv = vlc_fourcc_IsYUV(entry->fourcc);
assert((!is_yuv && (desc == NULL || desc->color_model != COLOR_MODEL_YUV)) || (is_yuv && desc != NULL && desc->color_model == COLOR_MODEL_YUV));
}VLC_CODEC_YUV2 was missing from the list of YUV formats.
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