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>
diff --git a/sound/soc/generic/simple-scu-card.c b/sound/soc/generic/simple-scu-card.c
index 44da691..a75b385 100644
--- a/sound/soc/generic/simple-scu-card.c
+++ b/sound/soc/generic/simple-scu-card.c
@@ -191,7 +191,7 @@
 	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;