ixgb: fix interface losing macaddr on ifdn/up

user contributed fix for LAA across down/up, from tonychung00@users.sf.net.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>

drivers/net/ixgb/ixgb_main.c

@@ -238,6 +238,7 @@ ixgb_up(struct ixgb_adapter *adapter)
 
 	/* hardware has been reset, we need to reload some things */
 
+	ixgb_rar_set(hw, netdev->dev_addr, 0);
 	ixgb_set_multi(netdev);
 
 	ixgb_restore_vlan(adapter);