[RFC] changes in target for UASP support

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Hi,

I'm facing three limitations in UASP (three I know about) where I need to
hack around in target:
- I have no idea how much data I receive/send. Patch #1 tries to address
  it
- I have no CmdQue support (command tagging) on HS. This is only available
  at SuperSpeed (USB3). Patch #2 tries to address it.
- I have no idea in which direction the command goes (DMA_FROM_DEVICE,
  .._TO_DEVICE, __NONE). I have no idea to how to get this from target.
  Right now I stored this information in an reserved field. This works for
  now/testing but can't stay that way. Any idea?

Sebastian

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