MAINTAINERS: add an explicit entry for YNL

Donald has been contributing to YNL a lot. Let's create a dedicated
MAINTAINERS entry and add make his involvement official :)

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Donald Hunter <donald.hunter@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: kuba-moo

MAINTAINERS

@@ -24468,6 +24468,14 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/har
 F:	Documentation/admin-guide/LSM/Yama.rst
 F:	security/yama/
 
+YAML NETLINK (YNL)
+M:	Donald Hunter <donald.hunter@gmail.com>
+M:	Jakub Kicinski <kuba@kernel.org>
+F:	Documentation/netlink/
+F:	Documentation/userspace-api/netlink/intro-specs.rst
+F:	Documentation/userspace-api/netlink/specs.rst
+F:	tools/net/ynl/
+
 YEALINK PHONE DRIVER
 M:	Henk Vergonet <Henk.Vergonet@gmail.com>
 L:	usbb2k-api-dev@nongnu.org