ASoC: simple-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-card.c

@@ -362,13 +362,9 @@ static int asoc_simple_card_parse_of(struct simple_card_data *priv)
 			goto card_parse_end;
 	}
 
-	/* DAPM routes */
-	if (of_property_read_bool(node, PREFIX "routing")) {
-		ret = snd_soc_of_parse_audio_routing(card,
-					PREFIX "routing");
-		if (ret)
-			goto card_parse_end;
-	}
+	ret = asoc_simple_card_of_parse_routing(card, PREFIX, 1);
+	if (ret < 0)
+		goto card_parse_end;
 
 	/* Factor to mclk, used in hw_params() */
 	of_property_read_u32(node, PREFIX "mclk-fs", &priv->mclk_fs);