net: lantiq: Do not use eth_change_mtu()

eth_change_mtu() is not needed any more, the networking subsystem will
call it automatically when this callback is not implemented.
Signed-off-by: NHauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/lantiq_xrx200.c

@@ -335,7 +335,6 @@ static const struct net_device_ops xrx200_netdev_ops = {
 	.ndo_start_xmit		= xrx200_start_xmit,
 	.ndo_set_mac_address	= eth_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_change_mtu		= eth_change_mtu,
 };
 
 static irqreturn_t xrx200_dma_irq(int irq, void *ptr)