can: rcar_can: add .ndo_change_mtu function

Use common can_change_mtu function.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/rcar_can.c

@@ -628,6 +628,7 @@ static const struct net_device_ops rcar_can_netdev_ops = {
 	.ndo_open = rcar_can_open,
 	.ndo_stop = rcar_can_close,
 	.ndo_start_xmit = rcar_can_start_xmit,
+	.ndo_change_mtu = can_change_mtu,
 };
 
 static void rcar_can_rx_pkt(struct rcar_can_priv *priv)