Merge remote-tracking branch 'remotes/kraxel/tags/pull-usb-20150508-1' into staging

usb: qomify, bugfixes for xhci & uhci.

# gpg: Signature made Fri May  8 12:39:28 2015 BST using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-usb-20150508-1:
  uhci: controller is halted after reset
  usb: usb-serial QOMify
  usb: usb-redir QOMify
  usb: usb-wacom-tablet QOMify
  usb: usb-uas QOMify
  usb: usb-storage QOMify
  usb: usb-ccid QOMify
  usb: usb-net QOMify
  usb-mtp: fix segmentation fault
  usb: usb-mtp QOMify
  usb: usb-hub QOMify
  usb: usb-hid QOMify
  usb: usb-bt QOMify
  usb: usb-audio QOMify
  uhci: QOMify
  xhci: fix events for setup trb.
  Revert "xhci: generate a Transfer Event for each Transfer TRB with the IOC bit set"
  xhci: set timer to retry xfers
  usb: fix usb-net segfault

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>