[PATCH] ixgb: Ethtool cleanup patch from Stephen Hemminger

Ethtool cleanup patch from Stephen Hemminger
   * use ADVERTISED_xxx fields when setting advertised fields

Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Signed-off-by: Ganesh Venkatesan <ganesh.venkatesan@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>