ASoC: samsung: WM8994 depends on MFD_WM8994

Any driver that selects SND_SOC_WM8994 should also make sure that
MFD_WM8994 is set, since the codec relies on the mfd code:

  sound/built-in.o: In function `wm8994_read':
  last.c:(.text+0x20160): undefined reference to `wm8994_reg_read'
  sound/built-in.o: In function `wm8994_write':
  last.c:(.text+0x20e68): undefined reference to `wm8994_reg_write'

This solves the problem by selecting the MFD driver directly
and adding extra 'depends on' statements to make sure that we
respect the dependencies of that driver.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/samsung/Kconfig

@@ -64,6 +64,8 @@ config SND_SOC_SAMSUNG_SMDK_WM8580
 config SND_SOC_SAMSUNG_SMDK_WM8994
 	tristate "SoC I2S Audio support for WM8994 on SMDK"
 	depends on SND_SOC_SAMSUNG && (MACH_SMDKV310 || MACH_SMDKC210 || MACH_SMDK4212)
+	depends on I2C=y && GENERIC_HARDIRQS
+	select MFD_WM8994
 	select SND_SOC_WM8994
 	select SND_SAMSUNG_I2S
 	help
@@ -150,7 +152,9 @@ config SND_SOC_SMARTQ
 config SND_SOC_GONI_AQUILA_WM8994
 	tristate "SoC I2S Audio support for AQUILA/GONI - WM8994"
 	depends on SND_SOC_SAMSUNG && (MACH_GONI || MACH_AQUILA)
+	depends on I2C=y && GENERIC_HARDIRQS
 	select SND_SAMSUNG_I2S
+	select MFD_WM8994
 	select SND_SOC_WM8994
 	help
 	  Say Y if you want to add support for SoC audio on goni or aquila
@@ -174,6 +178,8 @@ config SND_SOC_SMDK_WM8580_PCM
 config SND_SOC_SMDK_WM8994_PCM
 	tristate "SoC PCM Audio support for WM8994 on SMDK"
 	depends on SND_SOC_SAMSUNG && (MACH_SMDKC210 || MACH_SMDKV310 || MACH_SMDK4212)
+	depends on I2C=y && GENERIC_HARDIRQS
+	select MFD_WM8994
 	select SND_SOC_WM8994
 	select SND_SAMSUNG_PCM
 	help