Merge branch 'remotes/lorenzo/pci/imx6'

Merge branch 'remotes/lorenzo/pci/imx6'

- Allow host controller driver to probe successfully (as other drivers do)
  even if link is currently down (Fabio Estevam)

- Enable i.MX6QP PCIe power management (Richard Zhu)

- Invoke PHY exit function after PHY power off (Richard Zhu)

- Assert i.MX8MM CLKREQ# even if no device present to avoid boot hangs
  (Richard Zhu)

* remotes/lorenzo/pci/imx6:
  PCI: imx6: Assert i.MX8MM CLKREQ# even if no device present
  PCI: imx6: Invoke the PHY exit function after PHY power off
  PCI: imx6: Enable i.MX6QP PCIe power management support
  PCI: imx6: Allow to probe when dw_pcie_wait_for_link() fails