ASoC: simple-scu-card: use asoc_simple_card_of_parse_routing()

Current simple/audio scu card drivers are supporting same
routing on DT, but, doesn't use same function for it.
Encapsulation is one of simple card util's purpose.
Let's use asoc_simple_card_of_parse_routing
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/simple-scu-card.c

@@ -191,7 +191,7 @@ static int asoc_simple_card_parse_of(struct simple_card_data *priv)
 	if (!node)
 		return -EINVAL;
 
-	ret = snd_soc_of_parse_audio_routing(card, PREFIX "routing");
+	ret = asoc_simple_card_of_parse_routing(card, PREFIX, 0);
 	if (ret < 0)
 		return ret;