ALSA: hda - Make CONFIG_SND_HDA_RECONFIG for codec reconfiguration

Make the codec re-configuration feature selectable via Kconfig,
CONFIG_SND_HDA_RECONFIG.
Also mark it as experimental (as it really is).

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 bf7ba8b..6f2fe0f 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -409,11 +409,19 @@
  */
 #ifdef CONFIG_SND_HDA_HWDEP
 int snd_hda_create_hwdep(struct hda_codec *codec);
-int snd_hda_hwdep_add_sysfs(struct hda_codec *codec);
 #else
 static inline int snd_hda_create_hwdep(struct hda_codec *codec) { return 0; }
 #endif
 
+#ifdef CONFIG_SND_HDA_RECONFIG
+int snd_hda_hwdep_add_sysfs(struct hda_codec *codec);
+#else
+static inline int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
+{
+	return 0;
+}
+#endif
+
 /*
  * power-management
  */