BUG: PCI incomplete setup

[Eric W. Biederman]

I need to review the code but as of last time I looked we have some
significant dificiencies in our PCI setup code.

1) We don't set the Latency timers which are a cards timeslice on the
   PCI bus.  This can result in non-peak performance from various PCI
   devices.

2) We don't setup any PCI arbiters, the PCI arbiter is the scheduler
   for the PCI bus.  This is less of an issue as generally, the
   hardware is relatively inefficient but it could still be an issue.

Eric