ALSA: hda: Drop unused snd_hda_queue_unsol_event()

The inline function is nowhere used.  Drop it.

Link: https://lore.kernel.org/r/20200516062854.22141-2-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/hda_codec.h

@@ -366,13 +366,6 @@ struct hda_verb {
 void snd_hda_sequence_write(struct hda_codec *codec,
 			    const struct hda_verb *seq);
 
-/* unsolicited event */
-static inline void
-snd_hda_queue_unsol_event(struct hda_bus *bus, u32 res, u32 res_ex)
-{
-	snd_hdac_bus_queue_event(&bus->core, res, res_ex);
-}
-
 /* cached write */
 static inline int
 snd_hda_codec_write_cache(struct hda_codec *codec, hda_nid_t nid,