ASoC: audio-graph-card: Add pm callbacks to platform driver

Set snd_soc_pm_ops for the pm ops to make sure that the ASoC level of PM
operations are going to happen. This is needed to get suspend/resume
working correctly when the audio is using audio-graph-card.
Reported-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
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

@@ -325,6 +325,7 @@ MODULE_DEVICE_TABLE(of, asoc_graph_of_match);
 static struct platform_driver asoc_graph_card = {
 	.driver = {
 		.name = "asoc-audio-graph-card",
+		.pm = &snd_soc_pm_ops,
 		.of_match_table = asoc_graph_of_match,
 	},
 	.probe = asoc_graph_card_probe,