ASoC: mmp-sspa: constify snd_soc_dai_ops structure

This structure is 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/pxa/mmp-sspa.c

@@ -380,7 +380,7 @@ static int mmp_sspa_probe(struct snd_soc_dai *dai)
 		SNDRV_PCM_FMTBIT_S24_LE | \
 		SNDRV_PCM_FMTBIT_S32_LE)
 
-static struct snd_soc_dai_ops mmp_sspa_dai_ops = {
+static const struct snd_soc_dai_ops mmp_sspa_dai_ops = {
 	.startup	= mmp_sspa_startup,
 	.shutdown	= mmp_sspa_shutdown,
 	.trigger	= mmp_sspa_trigger,