ASoC: alc5623: Fix Kconfig dependency

Add "depends on I2C" to shut up the build errors from randconfig.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/codecs/Kconfig

@@ -270,6 +270,7 @@ config SND_SOC_AK5386
 
 config SND_SOC_ALC5623
        tristate "Realtek ALC5623 CODEC"
+	depends on I2C
 
 config SND_SOC_ALC5632
 	tristate