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pcicfg: Fix direct calls of pci_cfg{read,write} on systems w/o PCI host bridge.

Description

pcicfg: Fix direct calls of pci_cfg{read,write} on systems w/o PCI host bridge.

Reported by: dexuan@
Reviewed by: jhb@
MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D10564