Merge branch 'pci/controller/layerscape'

- Add support for link-down notification so the endpoint driver can process
  LINK_DOWN events (Frank Li)

- Save Link Capabilities during probe so they can be restored when handling
  a link-up event, since the controller loses the Link Width and Link Speed
  values during reset (Xiaowei Bao)

* pci/controller/layerscape:
  PCI: layerscape: Add workaround for lost link capabilities during reset
  PCI: layerscape: Add support for link-down notification