ASoC: Intel: Atom: constify snd_soc_dai_ops structures

These structures are only stored in the ops field of a snd_soc_dai_driver
structure. That field is declared const, so snd_soc_dai_ops structures
that have this property can be declared as const also.
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/atom/sst-mfld-platform-pcm.c

@@ -471,7 +471,7 @@ static void sst_disable_ssp(struct snd_pcm_substream *substream,
 	}
 }
 
-static struct snd_soc_dai_ops sst_media_dai_ops = {
+static const struct snd_soc_dai_ops sst_media_dai_ops = {
 	.startup = sst_media_open,
 	.shutdown = sst_media_close,
 	.prepare = sst_media_prepare,
@@ -480,11 +480,11 @@ static struct snd_soc_dai_ops sst_media_dai_ops = {
 	.mute_stream = sst_media_digital_mute,
 };
 
-static struct snd_soc_dai_ops sst_compr_dai_ops = {
+static const struct snd_soc_dai_ops sst_compr_dai_ops = {
 	.mute_stream = sst_media_digital_mute,
 };
 
-static struct snd_soc_dai_ops sst_be_dai_ops = {
+static const struct snd_soc_dai_ops sst_be_dai_ops = {
 	.startup = sst_enable_ssp,
 	.hw_params = sst_be_hw_params,
 	.set_fmt = sst_set_format,