- Use pci_enable_busmaster() and pci_enable_io() to update the command   register.  This really shouldn't be using pci_enable_io() directly as   bus_alloc_resource() does it already, but the cached copy of the   command word needs to be correct so the enable/disable mwi functions   work properly. - Use pci bus accessors to read revision ID and subvendor IDs.
- Use pci_enable_busmaster() and pci_enable_io() to update the command
  register.  This really shouldn't be using pci_enable_io() directly as
  bus_alloc_resource() does it already, but the cached copy of the
  command word needs to be correct so the enable/disable mwi functions
  work properly.
- Use pci bus accessors to read revision ID and subvendor IDs.

Reviewed by:	jvogel

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