ASoC: audio-graph-card: remove endpoint bidirectional check

DTC commit df536831d02c ("checks: add graph binding checks")
is checking endpoint bidirectional, and it is upstreamed to linux by
commit 50aafd60 ("scripts/dtc: Update to upstream version
v1.4.6-21-g84e414b0b5bc").
Let's remove own bidirectional check
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/audio-graph-card.c

@@ -167,16 +167,8 @@ static int asoc_graph_card_dai_link_of(struct device_node *cpu_port,
 	struct asoc_simple_dai *codec_dai = &dai_props->codec_dai;
 	struct device_node *cpu_ep    = of_get_next_child(cpu_port, NULL);
 	struct device_node *codec_ep = of_graph_get_remote_endpoint(cpu_ep);
-	struct device_node *rcpu_ep = of_graph_get_remote_endpoint(codec_ep);
 	int ret;
 
-	if (rcpu_ep != cpu_ep) {
-		dev_err(dev, "remote-endpoint mismatch (%s/%s/%s)\n",
-			cpu_ep->name, codec_ep->name, rcpu_ep->name);
-		ret = -EINVAL;
-		goto dai_link_of_err;
-	}
-
 	ret = asoc_simple_card_parse_daifmt(dev, cpu_ep, codec_ep,
 					    NULL, &dai_link->dai_fmt);
 	if (ret < 0)
@@ -228,7 +220,6 @@ static int asoc_graph_card_dai_link_of(struct device_node *cpu_port,
 
 dai_link_of_err:
 	of_node_put(cpu_ep);
-	of_node_put(rcpu_ep);
 	of_node_put(codec_ep);
 
 	return ret;