[S390] Kconfig: use common Kconfig files for s390.

Disband drivers/s390/Kconfig, use the common Kconfig files. The s390
specific config options from drivers/s390/Kconfig are moved to the
respective common Kconfig files.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 17ee97f..b4c8319 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -444,8 +444,6 @@
 	  this option is dangerous unless the CD-RW media is known good, as we
 	  don't do deferred write error handling yet.
 
-source "drivers/s390/block/Kconfig"
-
 config ATA_OVER_ETH
 	tristate "ATA over Ethernet support"
 	depends on NET
@@ -453,6 +451,8 @@
 	This driver provides Support for ATA over Ethernet block
 	devices like the Coraid EtherDrive (R) Storage Blade.
 
+source "drivers/s390/block/Kconfig"
+
 endmenu
 
 endif