ASoC: rt286: Add RL6347A class device shared support for RT286

The patch separates the IO function from the rt286. It is prepared to share
for new chips that support the same IO function.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 061c465..b826c71 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -507,6 +507,11 @@
 	default m if SND_SOC_RT5670=m
 	default m if SND_SOC_RT5677=m
 
+config SND_SOC_RL6347A
+	tristate
+	default y if SND_SOC_RT286=y
+	default m if SND_SOC_RT286=m
+
 config SND_SOC_RT286
 	tristate
 	depends on I2C