Overhaul resource handling and mapping in macepcibr(4):

- do not use a stinking extent to track bus_space_map allocations, but
  directly map in XKPHYS instead. What are 64 bit address spaces good for
  if we still need to use TLB for that?
- provide proper resource management extents to the MI pci code, so that,
  in turn, the cardbus code can reuse them instead of providing their own.
- use the whole 4GB address space window for PCI I/O resources, just
  because we can.
- make sure no device can get assigned address zero in I/O space, because
  this address triggers a PCI error.

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