bcm63xx_enet: use platform device id directly for miibus name

Directly use the platform device for generating the miibus name. This
removes the last user of bcm_enet_priv::mac_id and we can remove the
field.
Signed-off-by: NJonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bcm63xx_enet.c

@@ -1750,7 +1750,6 @@ static int bcm_enet_probe(struct platform_device *pdev)
 	dev->irq = priv->irq = res_irq->start;
 	priv->irq_rx = res_irq_rx->start;
 	priv->irq_tx = res_irq_tx->start;
-	priv->mac_id = pdev->id;
 
 	priv->mac_clk = devm_clk_get(&pdev->dev, "enet");
 	if (IS_ERR(priv->mac_clk)) {
@@ -1818,7 +1817,7 @@ static int bcm_enet_probe(struct platform_device *pdev)
 		bus->priv = priv;
 		bus->read = bcm_enet_mdio_read_phylib;
 		bus->write = bcm_enet_mdio_write_phylib;
-		sprintf(bus->id, "%s-%d", pdev->name, priv->mac_id);
+		sprintf(bus->id, "%s-%d", pdev->name, pdev->id);
 
 		/* only probe bus where we think the PHY is, because
 		 * the mdio read operation return 0 instead of 0xffff

drivers/net/ethernet/broadcom/bcm63xx_enet.h

@@ -193,9 +193,6 @@ struct bcm_enet_mib_counters {
 
 struct bcm_enet_priv {
 
-	/* mac id (from platform device id) */
-	int mac_id;
-
 	/* base remapped address of device */
 	void __iomem *base;