This patch has some updates to the hcd pci power management glue:

  - removes now-obsolete comments (driver model now exists)

  - better state transitions:
      * suspending "dead" controllers needn't oops
      * multi-resume case (pm bug) simplified
      * multi-suspend case likewise (not always a bug)
      * should handle transitions other than D0->D3{hot,cold}

  - prepares for usb remote wake up support, which will be
    wanting the driver model suspend/resume code to be ready.