ASoC: audio-graph-card2: add support for aux devices

Add device tree property to define auxiliary devices to be added to
Audio Graph Card which is already supported on Simle Card.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://msgid.link/r/878qz4ry81.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/audio-graph-card2.c

@@ -1398,6 +1398,10 @@ int audio_graph2_parse_of(struct simple_util_priv *priv, struct device *dev,
 
 	simple_util_debug_info(priv);
 
+	ret = snd_soc_of_parse_aux_devs(card, "aux-devs");
+	if (ret < 0)
+		goto err;
+
 	ret = devm_snd_soc_register_card(dev, card);
 err:
 	devm_kfree(dev, li);