[SCSI] zfcp: update maintainers file

As Andreas stated he will not maintain the zfcp driver anymore.
Instead I will take over the responsibility.
Signed-off-by: NSwen Schillig <swen@vnet.ibm.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

MAINTAINERS

@@ -2484,6 +2484,8 @@ W:	http://www.ibm.com/developerworks/linux/linux390/
 S:	Supported
 
 S390 ZFCP DRIVER
+P:	Swen Schillig
+M:	swen@vnet.ibm.com
 M:	linux390@de.ibm.com
 L:	linux-390@vm.marist.edu
 W:	http://www.ibm.com/developerworks/linux/linux390/