net: mvpp2: fill-in dev_port attribute

Fill this in so user-space can identify multiple ports on the same CP
unit.

Signed-off-by: Aryan Srivastava <aryan.srivastava@alliedtelesis.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Aryan Srivastava

drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c

@@ -6907,6 +6907,7 @@ static int mvpp2_port_probe(struct platform_device *pdev,
 	/* 9704 == 9728 - 20 and rounding to 8 */
 	dev->max_mtu = MVPP2_BM_JUMBO_PKT_SIZE;
 	device_set_node(&dev->dev, port_fwnode);
+	dev->dev_port = port->id;
 
 	port->pcs_gmac.ops = &mvpp2_phylink_gmac_pcs_ops;
 	port->pcs_gmac.neg_mode = true;