ASoC: soc-utils: make snd_soc_platform_driver const

Make this const as it is only passed as the 2nd argument to the function
snd_soc_register_platform, which is of type const.
Done using Coccinelle
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-utils.c

@@ -284,7 +284,7 @@ static const struct snd_pcm_ops dummy_dma_ops = {
 	.ioctl		= snd_pcm_lib_ioctl,
 };
 
-static struct snd_soc_platform_driver dummy_platform = {
+static const struct snd_soc_platform_driver dummy_platform = {
 	.ops = &dummy_dma_ops,
 };