net: macb: let miiphy_read/_write pass arbitrary addresses

This allows passing arbitrary addresses through macb_miiphy_read and
macb_miiphy_write, therefore enabling the mii command to access
all mdio bus devices instead of only the defined phy.

Signed-off-by: Josef Holzmayr <holzmayr@rsi-elektrotechnik.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 0f0ede1..8359425 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -241,11 +241,8 @@
 	struct macb_device *macb = to_macb(dev);
 #endif
 
-	if (macb->phy_addr != phy_adr)
-		return -1;
-
 	arch_get_mdio_control(bus->name);
-	value = macb_mdio_read(macb, macb->phy_addr, reg);
+	value = macb_mdio_read(macb, phy_adr, reg);
 
 	return value;
 }
@@ -261,11 +258,8 @@
 	struct macb_device *macb = to_macb(dev);
 #endif
 
-	if (macb->phy_addr != phy_adr)
-		return -1;
-
 	arch_get_mdio_control(bus->name);
-	macb_mdio_write(macb, macb->phy_addr, reg, value);
+	macb_mdio_write(macb, phy_adr, reg, value);
 
 	return 0;
 }