- Consolidate duplicated code for assigning interrupts to PCI devices via

  routing, etc. in a static pci_assign_interrupt() function.
- Add a sledgehammer that allows the user to override the interrupt
  assignment of any PCI device via a tunable (e.g. "hw.pci0.7.INTB=5" would
  force any functions on the pci device in slot 7 of bus 0 that use B# to
  use IRQ 5).  This should be used with great caution!  Generally, if the
  interrupt routing in use provides specific tunables (such as hard-wiring
  the IRQ for a given $PIR or ACPI PCI link device), then those should be
  used instead.  One instance where this tunable might be useful is if a
  box has an MPTable with duplicate entries for the same PCI device with
  different IRQs.

MFC after:	1 week

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