net: Update networking MAINTAINERS entry.

James and Patrick haven't been active in years.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -9046,9 +9046,7 @@ F:	lib/random32.c
 NETWORKING [IPv4/IPv6]
 M:	"David S. Miller" <davem@davemloft.net>
 M:	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
-M:	James Morris <jmorris@namei.org>
 M:	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
-M:	Patrick McHardy <kaber@trash.net>
 L:	netdev@vger.kernel.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git
 S:	Maintained