ASoC: max98090: Fix build warning

The max98090_{suspend,resume}() functions are used for system sleep and
therefore need to be guarded by CONFIG_PM_SLEEP rather than CONFIG_PM.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/codecs/max98090.c

@@ -2408,7 +2408,7 @@ static int max98090_runtime_suspend(struct device *dev)
 }
 #endif
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int max98090_resume(struct device *dev)
 {
 	struct max98090_priv *max98090 = dev_get_drvdata(dev);