[ALSA] hda-intel - Add hwdep interface

Added a hwdep interface for each codec (enabled per kconfig).
This interface can be used for reading/writing HD-audio verbs
and other purposes as future extensions.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

include/sound/asound.h

@@ -92,6 +92,7 @@ enum {
 	SNDRV_HWDEP_IFACE_USX2Y_PCM,	/* Tascam US122, US224 & US428 rawusb pcm */
 	SNDRV_HWDEP_IFACE_PCXHR,	/* Digigram PCXHR */
 	SNDRV_HWDEP_IFACE_SB_RC,	/* SB Extigy/Audigy2NX remote control */
+	SNDRV_HWDEP_IFACE_HDA,		/* HD-audio */
 
 	/* Don't forget to change the following: */
 	SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_SB_RC