decoder/mp4ff: support tags "albumartist", "band"

I'm not sure if mapping "band" to TAG_PERFORMER is correct, but it
might be better than nothing.

src/decoder/mp4ff_decoder_plugin.c

@@ -341,11 +341,13 @@ static const char *const mp4ff_tag_names[TAG_NUM_OF_ITEM_TYPES] = {
 	[TAG_TITLE] = "title",
 	[TAG_ARTIST] = "artist",
 	[TAG_ALBUM] = "album",
+	[TAG_ALBUM_ARTIST] = "albumartist",
 	[TAG_TRACK] = "track",
 	[TAG_DISC] = "disc",
 	[TAG_GENRE] = "genre",
 	[TAG_DATE] = "date",
 	[TAG_COMPOSER] = "writer",
+	[TAG_PERFORMER] = "band",
 };
 
 static struct tag *