av1 rfc6381: get color info in  gf_media_get_rfc_6381_codec_name() too
av1 rfc6381: get color info in  gf_media_get_rfc_6381_codec_name() too

rbouqueau/gpac,gpac/gpac,rbouqueau/gpac,rbouqueau/gpac,gpac/gpac,rbouqueau/gpac,gpac/gpac,gpac/gpac,gpac/gpac,gpac/gpac,gpac/gpac,rbouqueau/gpac,gpac/gpac,rbouqueau/gpac,rbouqueau/gpac,rbouqueau/gpac