usbdump: support xhciusbdump-usbhid

The XHCI HCD sends an OUT packet which was unexpected by the usbdump
code. That was the case because the core USB code that was normally
calling handle_control only called when the full data was received from
the host (from the Status stage, with PID == USB_TOKEN_IN).

Then there is also the do_parameter function as used by XHCI that was
not really handled. Fix this by allowing OUT tokens, also document
why this is necessary.

Signed-off-by: Peter Wu <peter@lekensteyn.nl>

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