ASoC: tegra: Staticise tegra_i2s_dai and tegra_spdif_dai

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/tegra/tegra_i2s.c b/sound/soc/tegra/tegra_i2s.c
index f36b996..6728fab 100644
--- a/sound/soc/tegra/tegra_i2s.c
+++ b/sound/soc/tegra/tegra_i2s.c
@@ -312,7 +312,7 @@
 	.trigger	= tegra_i2s_trigger,
 };
 
-struct snd_soc_dai_driver tegra_i2s_dai[] = {
+static struct snd_soc_dai_driver tegra_i2s_dai[] = {
 	{
 		.name = DRV_NAME ".0",
 		.probe = tegra_i2s_probe,