ixgbe: removed unused variable from setup_link_speed

Removes the autoneg parameter from the setup_link_speed functions.  These
functions do nothing with this parameter.

Signed-off-by: Josh Hay <joshua.a.hay@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>