MAINTAINERS: add myself as a maintainer of xen-netback

Signed-off-by: NPaul Durrant <paul.durrant@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Acked-by: NWei Liu <wei.liu2@citrix.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -13068,6 +13068,7 @@ F:	arch/arm64/include/asm/xen/
 
 XEN NETWORK BACKEND DRIVER
 M:	Wei Liu <wei.liu2@citrix.com>
+M:	Paul Durrant <paul.durrant@citrix.com>
 L:	xen-devel@lists.xenproject.org (moderated for non-subscribers)
 L:	netdev@vger.kernel.org
 S:	Supported