PCI: Pass available buses even if the bridge is already configured

If some part of the PCI topology is already configured (by the boot
firmware) but not all, and it includes hotplug bridges, we may need to
extend the bus resources of those bridges to accommodate any future
hotplugs, in the same way we already do with the normal hotplug case.

Pass the available buses to pci_scan_child_bus_extend() even when the
bridge in question is already configured so the bus allocation code can use
these available buses to extend the possible hotplug bridges below.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=216000
Link: https://lore.kernel.org/r/[email protected]
Reported-by: Chris Chiu <[email protected]>
Tested-by: Chris Chiu <[email protected]>
Signed-off-by: Mika Westerberg <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>

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