ALSA: hda - Clean up CONFIG_SND_HDA_POWER_SAVE

CONFIG_SND_HDA_POWER_SAVE is no longer an experimental feature and its
behavior can be well controlled via the default value and module
parameter.  Let's just replace it with the standard CONFIG_PM.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index 1b4c129..09dbdc3 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -529,7 +529,7 @@
 static inline int snd_hda_create_hwdep(struct hda_codec *codec) { return 0; }
 #endif
 
-#if defined(CONFIG_SND_HDA_POWER_SAVE) && defined(CONFIG_SND_HDA_HWDEP)
+#if defined(CONFIG_PM) && defined(CONFIG_SND_HDA_HWDEP)
 int snd_hda_hwdep_add_power_sysfs(struct hda_codec *codec);
 #else
 static inline int snd_hda_hwdep_add_power_sysfs(struct hda_codec *codec)