igb: Remove workaround for EEE configuration on i210/I211

This patch removes a workaround that was needed on pre-release hardware.
Released hardware should not have this setting, but any devices that do
will get a warning message instead.

Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>