ASoC: sh: make snd_soc_platform_driver const

Make these const as they are either passed as the 2nd argument to
the function devm_snd_soc_register_platform or snd_soc_register_platform,
and the arguments are of type const.
Done using Coccinelle.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/dma-sh7760.c

@@ -320,7 +320,7 @@ static int camelot_pcm_new(struct snd_soc_pcm_runtime *rtd)
 	return 0;
 }
 
-static struct snd_soc_platform_driver sh7760_soc_platform = {
+static const struct snd_soc_platform_driver sh7760_soc_platform = {
 	.ops		= &camelot_pcm_ops,
 	.pcm_new	= camelot_pcm_new,
 };

sound/soc/sh/fsi.c

@@ -1818,7 +1818,7 @@ static struct snd_soc_dai_driver fsi_soc_dai[] = {
 	},
 };
 
-static struct snd_soc_platform_driver fsi_soc_platform = {
+static const struct snd_soc_platform_driver fsi_soc_platform = {
 	.ops		= &fsi_pcm_ops,
 	.pcm_new	= fsi_pcm_new,
 };

sound/soc/sh/rcar/core.c

@@ -1339,7 +1339,7 @@ static int rsnd_pcm_new(struct snd_soc_pcm_runtime *rtd)
 		PREALLOC_BUFFER, PREALLOC_BUFFER_MAX);
 }
 
-static struct snd_soc_platform_driver rsnd_soc_platform = {
+static const struct snd_soc_platform_driver rsnd_soc_platform = {
 	.ops		= &rsnd_pcm_ops,
 	.pcm_new	= rsnd_pcm_new,
 };