s390: add scm bus driver

Bus driver to manage Storage Class Memory.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 443fac9..3781db2 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -433,6 +433,13 @@
 
 	  If unsure, say N.
 
+config SCM_BUS
+	def_bool y
+	depends on 64BIT
+	prompt "SCM bus driver"
+	help
+	  Bus driver for Storage Class Memory.
+
 endmenu
 
 menu "Dump support"