ASoC: rt286: make rt286_i2c_driver static

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/codecs/rt286.c b/sound/soc/codecs/rt286.c
index 8103315..218f86e 100644
--- a/sound/soc/codecs/rt286.c
+++ b/sound/soc/codecs/rt286.c
@@ -1206,7 +1206,7 @@
 }
 
 
-struct i2c_driver rt286_i2c_driver = {
+static struct i2c_driver rt286_i2c_driver = {
 	.driver = {
 		   .name = "rt286",
 		   .owner = THIS_MODULE,