ASoC: Intel: make snd_soc_platform_driver const

Make these const as they are 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/intel/atom/sst-mfld-platform-pcm.c

@@ -705,7 +705,7 @@ static int sst_soc_probe(struct snd_soc_platform *platform)
 	return sst_dsp_init_v2_dpcm(platform);
 }
 
-static struct snd_soc_platform_driver sst_soc_platform_drv  = {
+static const struct snd_soc_platform_driver sst_soc_platform_drv  = {
 	.probe		= sst_soc_probe,
 	.ops		= &sst_platform_ops,
 	.compr_ops	= &sst_platform_compr_ops,