ALSA: pcm: Constify the list in snd_pcm_hw_constraint_list

Allows the constraint lists to be declared const by drivers which seems
reasonable; there's plenty of other constification we could do if we were
being complete but this was easy and quick.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/pcm.h

@@ -264,7 +264,7 @@ struct snd_pcm_hw_constraint_ratdens {
 
 struct snd_pcm_hw_constraint_list {
 	unsigned int count;
-	unsigned int *list;
+	const unsigned int *list;
 	unsigned int mask;
 };
 
@@ -781,7 +781,8 @@ void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interva
 			  unsigned int k, struct snd_interval *c);
 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 			  const struct snd_interval *b, struct snd_interval *c);
-int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
+int snd_interval_list(struct snd_interval *i, unsigned int count,
+		      const unsigned int *list, unsigned int mask);
 int snd_interval_ratnum(struct snd_interval *i,
 			unsigned int rats_count, struct snd_ratnum *rats,
 			unsigned int *nump, unsigned int *denp);