ALSA: hda - Add hints for reconfig

This patch adds the "hints" for reconfiguring codecs.  The hints
are simply string arrays and can be freely used/parsed by the codec
patch.  The hints can be input via hwdep sysfs files.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 38a9bb6..a77ba22 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -754,6 +754,7 @@
 #ifdef CONFIG_SND_HDA_HWDEP
 	struct snd_hwdep *hwdep;	/* assigned hwdep device */
 	struct snd_array init_verbs;	/* additional init verbs */
+	struct snd_array hints;		/* additional hints */
 #endif
 
 	/* misc flags */