mfd: mc13xxx core should not be user visible

Since the core is not usable without one of the bus modules it should not
be presented in the UI but should instead be selected by the bus modules.
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

drivers/mfd/Kconfig

@@ -623,7 +623,7 @@ config MFD_MC13783
 	tristate
 
 config MFD_MC13XXX
-	tristate "Support Freescale MC13783 and MC13892"
+	tristate
 	depends on SPI_MASTER || I2C
 	select MFD_CORE
 	select MFD_MC13783
@@ -633,24 +633,22 @@ config MFD_MC13XXX
 	  additional drivers must be enabled in order to use the
 	  functionality of the device.
 
-if MFD_MC13XXX
-
 config MFD_MC13XXX_SPI
-	tristate "MC13xxx SPI interface" if SPI_MASTER
-	default SPI_MASTER
+	tristate "Freescale MC13783 and MC13892 SPI interface"
+	depends on SPI_MASTER
 	select REGMAP_SPI
+	select MFD_MC13XXX
 	help
 	  Select this if your MC13xxx is connected via an SPI bus.
 
 config MFD_MC13XXX_I2C
-	tristate "MC13xxx I2C interface" if I2C
-	default I2C
+	tristate "Freescale MC13892 I2C interface"
+	depends on I2C
 	select REGMAP_I2C
+	select MFD_MC13XXX
 	help
 	  Select this if your MC13xxx is connected via an I2C bus.
 
-endif
-
 config ABX500_CORE
 	bool "ST-Ericsson ABX500 Mixed Signal Circuit register functions"
 	default y if ARCH_U300 || ARCH_U8500