ASoC: audio-graph-card2: remove Experimental announce

Audio Graph Card2 has been announcing "Audio Graph Card2 is
still under Experimental stage", but it is time to remove it.
This patch removes it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87k042nm6s.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

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

@@ -1272,9 +1272,6 @@ int audio_graph2_parse_of(struct asoc_simple_priv *priv, struct device *dev,
 	if (ret < 0)
 		dev_err_probe(dev, ret, "parse error\n");
 
-	if (ret == 0)
-		dev_warn(dev, "Audio Graph Card2 is still under Experimental stage\n");
-
 	return ret;
 }
 EXPORT_SYMBOL_GPL(audio_graph2_parse_of);