MAINTAINERS: Add netdev subsystem profile link

The netdev subsystem has had a subsystem process document for a while
now. Link it appropriately in MAINTAINERS with the P: tag.

Cc: Jakub Kicinski <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Paolo Abeni <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: kees

MAINTAINERS

@@ -14994,6 +14994,7 @@ M:	Jakub Kicinski <[email protected]>
 M:	Paolo Abeni <[email protected]>
 L:	[email protected]
 S:	Maintained
+P:	Documentation/process/maintainer-netdev.rst
 Q:	https://patchwork.kernel.org/project/netdevbpf/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git
@@ -15045,6 +15046,7 @@ M:	Jakub Kicinski <[email protected]>
 M:	Paolo Abeni <[email protected]>
 L:	[email protected]
 S:	Maintained
+P:	Documentation/process/maintainer-netdev.rst
 Q:	https://patchwork.kernel.org/project/netdevbpf/list/
 B:	mailto:[email protected]
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git