Staging: batman-adv: Replace Andrew Lunn as Staging maintainer

Andrew Lunn didn't submit patches to staging since a while and may not
be the right person for new patches.
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/batman-adv/TODO

@@ -9,6 +9,6 @@
 Please send all patches to:
 	Marek Lindner <lindner_marek@yahoo.de>
 	Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
-	Andrew Lunn <andrew@lunn.ch>
+	Sven Eckelmann <sven.eckelmann@gmx.de>
 	b.a.t.m.a.n@lists.open-mesh.org
 	Greg Kroah-Hartman <gregkh@suse.de>