MAINTAINERS: add entry for s390 SCM driver

Storage Class Memory driver support for s390 architecture has been there
for a while. The original author of this work, Sebastian Ott has left IBM
and I am taking over this module. Adding myself as the upstream maintainer
for SCM on s390 architecture.
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

MAINTAINERS

@@ -18320,6 +18320,13 @@ F:	arch/s390/pci/
 F:	drivers/pci/hotplug/s390_pci_hpc.c
 F:	Documentation/s390/pci.rst
 
+S390 SCM DRIVER
+M:	Vineeth Vijayan <vneethv@linux.ibm.com>
+L:	linux-s390@vger.kernel.org
+S:	Supported
+F:	drivers/s390/block/scm*
+F:	drivers/s390/cio/scm.c
+
 S390 VFIO AP DRIVER
 M:	Tony Krowiak <akrowiak@linux.ibm.com>
 M:	Halil Pasic <pasic@linux.ibm.com>