ALSA: pcxhr: make snd_pcm_hardware const

Make this const as it is only used during a copy operation.
Done using Coccinelle
Signed-off-by: NBhumika Goyal <bhumirks@gmail.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/pcxhr/pcxhr.c

@@ -986,7 +986,7 @@ static int pcxhr_hw_free(struct snd_pcm_substream *subs)
 /*
  *  CONFIGURATION SPACE for all pcms, mono pcm must update channels_max
  */
-static struct snd_pcm_hardware pcxhr_caps =
+static const struct snd_pcm_hardware pcxhr_caps =
 {
 	.info             = (SNDRV_PCM_INFO_MMAP |
 			     SNDRV_PCM_INFO_INTERLEAVED |