Merge branch 'pci/hotplug'

- Ignore pciehp Link Down/Up caused by DPC so device remains bound to
  driver (Lukas Wunner)

- Declare global cpci_debug in header file (Krzysztof Wilczyński)

* pci/hotplug:
  PCI: cpcihp: Declare cpci_debug in header file
  PCI: pciehp: Ignore Link Down/Up caused by DPC