can: xilinx_can: add .ndo_change_mtu function

Use common can_change_mtu function.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
index 47b2f80..8a998e3 100644
--- a/drivers/net/can/xilinx_can.c
+++ b/drivers/net/can/xilinx_can.c
@@ -962,6 +962,7 @@
 	.ndo_open	= xcan_open,
 	.ndo_stop	= xcan_close,
 	.ndo_start_xmit	= xcan_start_xmit,
+	.ndo_change_mtu	= can_change_mtu,
 };
 
 /**