mfd: have TMIO drivers and subdevices depend on ARM

The TMIO chips are only found (and thus tested) on ARM machines.
Moreover, we don't want the TMIO cells to be built if one of the TMIO
driver is not selected (which indirectly make the TMIO cells drivers
depend on ARM as well).

Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 6fef078..ea8d7a3 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -176,7 +176,7 @@
 
 config MMC_TMIO
 	tristate "Toshiba Mobile IO Controller (TMIO) MMC/SD function support"
-	depends on MFD_CORE
+	depends on MFD_TMIO
 	help
 	  This provides support for the SD/MMC cell found in TC6393XB,
 	  T7L66XB and also ipaq ASIC3