Merge branch 'pci/controller/dwc'

- Wait for link to come up only if we've initiated link training (Ajay
  Agarwal)

- Save and restore imx6 Root Port MSI control to work around hardware
  defect (Richard Zhu)

* pci/controller/dwc:
  PCI: imx6: Save and restore root port MSI control in suspend and resume
  PCI: dwc: Wait for link up only if link is started