ALSA: hda - Remove superfluous hda_nid_t definition in hda_codec.h

Just forgotten to remove.  It's now in sound/hdaudio.h.
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.h

@@ -69,9 +69,6 @@ struct hda_codec;
 struct hda_pcm;
 struct hda_pcm_stream;
 
-/* NID type */
-typedef u16 hda_nid_t;
-
 /* bus operators */
 struct hda_bus_ops {
 	/* send a single command */