ASoC: Samsung: Fix build error due to missing dependency

Depend on MFD_ARIZONA to avoid the following build errors:

sound/soc/codecs/arizona.c:218: undefined reference to `arizona_request_irq'
sound/soc/codecs/arizona.c:226: undefined reference to `arizona_request_irq'
sound/soc/codecs/arizona.c:1719: undefined reference to `arizona_request_irq'

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/samsung/Kconfig

diff --git a/sound/soc/samsung/Kconfig b/sound/soc/samsung/Kconfig
index e8fbf4e..454f41c 100644
--- a/sound/soc/samsung/Kconfig
+++ b/sound/soc/samsung/Kconfig
@@ -210,7 +210,7 @@
 
 config SND_SOC_BELLS
 	tristate "Audio support for Wolfson Bells"
-	depends on SND_SOC_SAMSUNG && MACH_WLF_CRAGG_6410
+	depends on SND_SOC_SAMSUNG && MACH_WLF_CRAGG_6410 && MFD_ARIZONA
 	select SND_SAMSUNG_I2S
 	select SND_SOC_WM5102
 	select SND_SOC_WM5110