ASoC: intel: constify snd_pcm_ops structures

snd_pcm_ops are not supposed to change at runtime. All functions
working with snd_pcm_ops provided by <sound/soc.h> work with
const snd_pcm_ops. So mark the non-const structs as const.
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/intel/baytrail/sst-baytrail-pcm.c

@@ -309,7 +309,7 @@ static int sst_byt_pcm_mmap(struct snd_pcm_substream *substream,
 	return snd_pcm_lib_default_mmap(substream, vma);
 }
 
-static struct snd_pcm_ops sst_byt_pcm_ops = {
+static const struct snd_pcm_ops sst_byt_pcm_ops = {
 	.open		= sst_byt_pcm_open,
 	.close		= sst_byt_pcm_close,
 	.ioctl		= snd_pcm_lib_ioctl,