Merge branch 'pci/devtree-create'

Merge branch 'pci/devtree-create'

- Add device_add_of_node() to set dev->of_node and dev->fwnode only if they
  haven't been set already (Herve Codina)

- Allow of_pci_set_address() to set the DT address property for root bus
  nodes, where there is no PCI bridge to supply the PCI bus/device/function
  part of the property (Herve Codina)

- Create DT nodes for PCI host bridges to enable loading device tree
  overlays to create platform devices for PCI devices that have several
  features that require multiple drivers (Herve Codina)

* pci/devtree-create:
  PCI: of: Create device tree PCI host bridge node
  PCI: of_property: Constify parameter in of_pci_get_addr_flags()
  PCI: of_property: Add support for NULL pdev in of_pci_set_address()
  PCI: of: Use device_{add,remove}_of_node() to attach of_node to existing device
  driver core: Introduce device_{add,remove}_of_node()