of: of_mdio: export symbol of_mdiobus_link_phydev

Make of_mdiobus_link_phydev externally available.
This fixes CONFIG_OF_MDIO=m.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: 86f6cf41272 ("net: of_mdio: add of_mdiobus_link_phydev()")
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/of/of_mdio.c

@@ -214,6 +214,7 @@ void of_mdiobus_link_phydev(struct mii_bus *mdio,
 		}
 	}
 }
+EXPORT_SYMBOL(of_mdiobus_link_phydev);
 
 /* Helper function for of_phy_find_device */
 static int of_phy_match(struct device *dev, void *phy_np)