John Baldwin 6f0d58848f Export a few symbols as globals to allow subclassing of this driver. In
OOP speak, you would mark these as 'protected' members.  Specifically:
- Make the pcib_softc struct public so it can be used by subclasses.
- Make pcib_{read,write}_ivar(), pcib_alloc_resource(), pcib_maxslots(),
  and pcib_{read,write}_config() globals that can be used by subclasses.
- Make the pcib devclass a global variable.
- Move most of the pcib_attach() function into a global
  pcib_attach_common() function that can be called by the attach routines
  of subclasses.

Tested on:	i386, alpha, sparc64, ia64
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