ASoC: rt286: Add depends on I2C

rt286 use I2C as its I/O. So the driver can only available when
I2C is selected.

Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 8838838e..00ae24b 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -464,6 +464,7 @@
 
 config SND_SOC_RT286
 	tristate
+	depends on I2C
 
 config SND_SOC_RT5631
 	tristate