Add in a currently-disabled WAR for PCI NICs.

Some earlier series (~AR5212?) play badly with BIOSes.

In these instances, they may require a forced reset (by transitioning
the NIC through D0 -> D3 -> D0) before they probe/attach correctly.

This is currently disabled because:

* I haven't figured out the "right" code to ensure this only happens
  for PCI NICs (not PCIe or Cardbus);
* I haven't at all done wide scale testing for this, and I'm not yet
  ready for said wide-scale testing.

I'm documenting this primarily so users with misbehaving NICs have
something to tinker with.

Obtained from:	Atheros

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