PCI: Set pci_dev dev_node early so IOAPIC irq_descs are allocated locally

Otherwise irq_desc for PCI bridge with hot-added IOAPIC may not be
allocated on the local node.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>