ath79: fix link for long cables with OCEDO Raccoon
The OCEDO Raccoon had significant packet-loss with cables longer than 50
meter. Disabling EEE restores normal operation.
Also change the ethernet config to reduce loss on sub-1G links.
Signed-off-by: David Bauer <[email protected]>
(cherry picked from commit 4551bfd91f31be5987727c77e58333fa06ba3acd)