ASoC: qcom: sc7180: Add missing PM ops

Use PM ops snd_soc_pm_ops to handle suspend/resume like other machine
drivers.
Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
Link: https://lore.kernel.org/r/20201109103415.607495-1-cychiang@chromium.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/qcom/sc7180.c

@@ -258,6 +258,7 @@ static struct platform_driver sc7180_snd_driver = {
 	.driver = {
 		.name = "msm-snd-sc7180",
 		.of_match_table = sc7180_snd_device_id,
+		.pm = &snd_soc_pm_ops,
 	},
 };
 module_platform_driver(sc7180_snd_driver);