Merge branch 'pci/pwrctrl'

- Don't try to power on/off devices unless we know they actually support
  power control (Manivannan Sadhasivam)

* pci/pwrctrl:
  PCI/pwrctrl: Lock device when calling device_is_bound()
  PCI/pwrctrl: Do not try to power on/off devices that don't need pwrctrl
  PCI/pwrctrl: Move pci_pwrctrl_is_required() earlier in file