MAINTAINERS: s390/net: add netdev list

Discussions for network-related code should include the netdev list.
Signed-off-by: NJulian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -15944,6 +15944,7 @@ S390 IUCV NETWORK LAYER
 M:	Julian Wiedmann <jwi@linux.ibm.com>
 M:	Karsten Graul <kgraul@linux.ibm.com>
 L:	linux-s390@vger.kernel.org
+L:	netdev@vger.kernel.org
 S:	Supported
 W:	http://www.ibm.com/developerworks/linux/linux390/
 F:	drivers/s390/net/*iucv*
@@ -15954,6 +15955,7 @@ S390 NETWORK DRIVERS
 M:	Julian Wiedmann <jwi@linux.ibm.com>
 M:	Karsten Graul <kgraul@linux.ibm.com>
 L:	linux-s390@vger.kernel.org
+L:	netdev@vger.kernel.org
 S:	Supported
 W:	http://www.ibm.com/developerworks/linux/linux390/
 F:	drivers/s390/net/