Serhii and others have experienced PSGMII link degradation up to point
that it actually does not pass packets at all or packets arrive as zeros.
This usually happened after a couple of hot reboots.
Serhii has managed to track it down to PSGMII calibration not being done
properly and has fixed it, so all of the code is Serhii-s work.
Signed-off-by: Serhii Serhieiev <adron@mstnt.com>
Signed-off-by: Robert Marko <robert.marko@sartura.hr>