Revert "e1000: Try auto-negotiation for fixed 100 or 10 configuration"
This reverts commit 9ab4dfce8feda8cf3545be0c3c7569095b1fcd24.
OPNsense users have reported a regression with fixed configs.
The e1000 api is not ready for this change.
(cherry picked from commit 66dad2db0a484d65df331df76db0b68ef518f4db)