More Ethernet initialization rework

Hello,

This patch set moves initialization of most Ethernet controllers to board or CPU code. A few of the more complicated ones remain, but the goal is to implement this on all controllers.

Notes:
1. I obviously wasn't able to test many of these. I compiled what I
could with the tools on hand, but there's a chance for some breakage.
2. Many, many boards are affected by this. I didn't copy the
individual board maintainers because, well, that would be a lot of work :) Each patch lists the boards that are modified directly.
3. I've tried to design this so that people can still choose
different PCI-based Ethernet controllers with a simple CONFIG change. I appreciate feedback on this implementation.

regards,
Ben