lan78xx: Don't reset the interface on open

With Alexander Graf's patch ("lan78xx: Connect phy early") applied,
the call to lan78xx_reset within lan78xx_open prevents the phy
interrupt from being generated (even though the link is up).

Avoid this issue by removing the lan78xx_reset call.

See: #2437
     #2442
     #2457

drivers/net/usb/lan78xx.c

@@ -2563,10 +2563,6 @@ static int lan78xx_open(struct net_device *net)
 	if (ret < 0)
 		goto out;
 
-	ret = lan78xx_reset(dev);
-	if (ret < 0)
-		goto done;
-
 	phy_start(net->phydev);
 
 	netif_dbg(dev, ifup, dev->net, "phy initialised successfully");