ASoC: samsung: Add missing pm ops for Snow sound card driver

Adding missing pm ops so that audio playback works across
suspend and resume cycle.

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/samsung/snow.c b/sound/soc/samsung/snow.c
index 0fa89a4..014c177 100644
--- a/sound/soc/samsung/snow.c
+++ b/sound/soc/samsung/snow.c
@@ -111,6 +111,7 @@
 	.driver = {
 		.name = "snow-audio",
 		.owner = THIS_MODULE,
+		.pm = &snd_soc_pm_ops,
 		.of_match_table = snow_of_match,
 	},
 	.probe = snow_probe,