[S390] Kconfig: menus with depends on HAS_IOMEM.

Add "depends on HAS_IOMEM" to a number of menus to make them
disappear for s390 which does not have I/O memory.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index ab6e985..a20a51e 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -3,6 +3,7 @@
 #
 
 menu "Multifunction device drivers"
+	depends on HAS_IOMEM
 
 config MFD_SM501
 	tristate "Support for Silicon Motion SM501"