[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/video/Kconfig b/drivers/video/Kconfig
index 9a256d2..f544388 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -3,6 +3,7 @@
 #
 
 menu "Graphics support"
+	depends on HAS_IOMEM
 
 source "drivers/video/backlight/Kconfig"
 source "drivers/video/display/Kconfig"