kirkwood: fix calls to kirkwood_mpp_conf

With the new second save argument introduced by the previous patch, all
the calls to the function had to be fixed.

Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Holger Brunck <holger.brunck@keymile.com>
cc: Prafulla Wadaskar <prafulla@marvell.com>

board/raidsonic/ib62x0/ib62x0.c

@@ -66,7 +66,7 @@ int board_early_init_f(void)
 		MPP29_GPIO,     /* USB Copy button */
 		0
 	};
-	kirkwood_mpp_conf(kwmpp_config);
+	kirkwood_mpp_conf(kwmpp_config, NULL);
 	return 0;
 }