ethernet:ti:cpsw: fix phy identification with multiple slaves on fixed-phy

When using more than one slave with ti cpsw and fixed phy the pd->phy_id
will be always zero, but slave_data->phy_id must be unique. pd->phy_id
means a "phy hardware id" whereas slave_data->phy_id means an "unique id",
so we should use pd->addr which has the same unique meaning.

Fixes: 1f71e8c9 ("drivers: net: cpsw: Add support for fixed-link PHY")
Signed-off-by: NPascal Speck <kernel@iktek.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/cpsw.c

@@ -2047,7 +2047,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
 			if (!pd)
 				return -ENODEV;
 			snprintf(slave_data->phy_id, sizeof(slave_data->phy_id),
-				 PHY_ID_FMT, pd->bus->id, pd->phy_id);
+				 PHY_ID_FMT, pd->bus->id, pd->addr);
 			goto no_phy_slave;
 		}
 		parp = of_get_property(slave_node, "phy_id", &lenp);