Add rfkill to MAINTAINERS file

I have been acting as the maintainer since the rfkill introduction,
so lets make it official by adding a rfkill entry in the MAINTAINERS file.
Signed-off-by: NIvo van Doorn <IvDoorn@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

MAINTAINERS

@@ -3342,6 +3342,13 @@ L:	reiserfs-devel@vger.kernel.org
 W:	http://www.namesys.com
 S:	Supported
 
+RFKILL
+P:	Ivo van Doorn
+M:	IvDoorn@gmail.com
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	net/rfkill
+
 ROCKETPORT DRIVER
 P:	Comtrol Corp.
 W:	http://www.comtrol.com