Merge remote-tracking branch 'kraxel/usb.38' into staging

Merge remote-tracking branch 'kraxel/usb.38' into staging

* kraxel/usb.38: (28 commits)
  xhci: handle USB_RET_NAK
  xhci: remote wakeup support
  xhci: kill port arg from xhci_setup_packet
  xhci: stop on errors
  xhci: add trb type name lookup support.
  xhci: signal low- and fullspeed support
  usb: add USBBusOps->wakeup_endpoint
  usb: pass USBEndpoint to usb_wakeup
  usb: maintain async packet list per endpoint
  usb: Set USBEndpoint in usb_packet_setup().
  usb: add USBEndpoint->{nr,pid}
  usb: USBPacket: add status, rename owner -> ep
  usb: fold usb_generic_handle_packet into usb_handle_packet
  usb: kill handle_packet callback
  usb-xhci: switch to usb_find_device()
  usb-musb: switch to usb_find_device()
  usb-ohci: switch to usb_find_device()
  usb-ehci: switch to usb_find_device()
  usb-uhci: switch to usb_find_device()
  usb: handle dev == NULL in usb_handle_packet()
  ...