Revert "net: genet: enable link energy detect powerdown for external PHYs"

This reverts commit bd61974.

Author: nbuchwitz

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

@@ -312,8 +312,6 @@ int bcmgenet_mii_probe(struct net_device *dev)
 	/* Communicate the integrated PHY revision */
 	if (priv->internal_phy)
 		phy_flags = priv->gphy_rev;
-	else
-		phy_flags = PHY_BRCM_AUTO_PWRDWN_ENABLE;
 
 	/* This is an ugly quirk but we have not been correctly interpreting
 	 * the phy_interface values and we have done that across different