ASoC: Staticise au1xpsc_soc_platform

Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/au1x/dbdma2.c

@@ -341,7 +341,7 @@ static int au1xpsc_pcm_new(struct snd_soc_pcm_runtime *rtd)
 }
 
 /* au1xpsc audio platform */
-struct snd_soc_platform_driver au1xpsc_soc_platform = {
+static struct snd_soc_platform_driver au1xpsc_soc_platform = {
 	.ops		= &au1xpsc_pcm_ops,
 	.pcm_new	= au1xpsc_pcm_new,
 	.pcm_free	= au1xpsc_pcm_free_dma_buffers,