Revert "net: bcmgenet: Ensure MDIO unregistration has clocks enabled"

This reverts commit 1b5ea7ff ("net:
bcmgenet: Ensure MDIO unregistration has clocks enabled"). This is no
longer necessary now that the MDIO bus controller has a clock that it
can manage around the I/O accesses.
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/genet/bcmmii.c

@@ -678,7 +678,5 @@ void bcmgenet_mii_exit(struct net_device *dev)
 	if (of_phy_is_fixed_link(dn))
 		of_phy_deregister_fixed_link(dn);
 	of_node_put(priv->phy_dn);
-	clk_prepare_enable(priv->clk);
 	platform_device_unregister(priv->mii_pdev);
-	clk_disable_unprepare(priv->clk);
 }