ASoC: spear: constify snd_soc_dai_ops structures

These snd_soc_dai_ops structures are only stored in the ops field of
a snd_soc_dai_driver structure, which is const.  Thus, the
snd_soc_dai_ops structures can be const too.

Done with the help of Coccinelle.
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/spear/spdif_in.c

@@ -151,7 +151,7 @@ static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,
 	return ret;
 }
 
-static struct snd_soc_dai_ops spdif_in_dai_ops = {
+static const struct snd_soc_dai_ops spdif_in_dai_ops = {
 	.shutdown	= spdif_in_shutdown,
 	.trigger	= spdif_in_trigger,
 	.hw_params	= spdif_in_hw_params,