Merge remote-tracking branch 'remotes/kraxel/tags/pull-usb-20160321-1' into staging

usb: bugfix collection.

# gpg: Signature made Mon 21 Mar 2016 11:07:39 GMT 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-20160321-1:
  usb: ehci: add capability mmio write function
  hw/usb/dev-mtp: Guard inotify usage with CONFIG_INOTIFY1
  usb: fix unbound stack warning for inotify_watchfn
  usb: fix unbound stack usage for usb_mtp_add_str
  usb: fix unbounded stack warning for xhci_dma_write_u32s
  usb: Fix compilation for Windows

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