Merge branch 'pci/host-imx6' into next

* pci/host-imx6:
  PCI: imx6: Fix bugs in PCIe startup code
  PCI: imx6: Start link in Gen1 before negotiating for Gen2 mode
  PCI: imx6: Factor out link up wait loop
  PCI: imx6: Factor out PHY reset
  PCI: imx6: Report "link up" only after link training completes
  PCI: imx6: Make reset-gpio optional