ALSA: xen-front: remove unused struct 'alsa_sndif_hw_param'

'alsa_sndif_hw_param' has been unused since the original
commit 1cee5593 ("ALSA: xen-front: Implement ALSA virtual sound
driver").

Remove it.
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://lore.kernel.org/r/20240601232604.198662-1-linux@treblig.orgSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/xen/xen_snd_front_alsa.c

@@ -69,11 +69,6 @@ struct alsa_sndif_sample_format {
 	snd_pcm_format_t alsa;
 };
 
-struct alsa_sndif_hw_param {
-	u8 sndif;
-	snd_pcm_hw_param_t alsa;
-};
-
 static const struct alsa_sndif_sample_format ALSA_SNDIF_FORMATS[] = {
 	{
 		.sndif = XENSND_PCM_FORMAT_U8,