PCI: xgene: Assign resources to bus before adding new devices

The X-Gene PCIe driver assumes pci_scan_root_bus() assigns resources as
proposed in [1].  But we dropped patch [1] because it would break some
architectures, which means the X-Gene PCIe driver is currently broken.

Add calls to scan the bus, assign resources, and add devices in the X-Gene
driver to fix this.

[bhelgaas: changelog]
[1] http://lkml.kernel.org/r/[email protected]
Signed-off-by: Duc Dang <[email protected]>
Signed-off-by: Tanmay Inamdar <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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