PCI: designware: Use pci_scan_root_bus() for simplicity

After b97ea289cf6a ("PCI: Assign resources before drivers claim devices
(pci_scan_root_bus())"), pci_scan_root_bus() no longer adds the devices, so
it is equivalent to:

  pci_create_root_bus()
  pci_scan_child_bus()

Use pci_scan_root_bus() to simplify the code.

[bhelgaas: changelog]
Signed-off-by: Yijing Wang <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Lucas Stach <[email protected]>
Acked-by: Jingoo Han <[email protected]>
CC: Mohit Kumar <[email protected]>

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