John Baldwin 67e7d085ae Add a pcib_attach_child() method to manage adding the child "pci" device.
This allows the PCI-PCI bridge driver to save a reference to the child
device in its softc.

Note that this required moving the "pci" device creation out of
acpi_pcib_attach().  Instead, acpi_pcib_attach() is renamed to
acpi_pcib_fetch_prt() as it's sole action now is to fetch the PCI
interrupt routing table.

Differential Revision:	https://reviews.freebsd.org/D6021
2016-04-27 16:39:05 +00:00
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