my pending queue including configfs for the gadgets

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The queue ends with the configfs interface. It was tested with f_acm and
multiple configifs.
In order to move a function over to the configfs interface:
- convert to function interface, i.e. use DECLARE_USB_FUNCTION_INIT()
- use usb_gstrings_attach() to allocate the USB ids for a given function.
  Once all functions are using it, the stuct usb_gadget_strings can removed
  from usb_function / usb_configuration / usb_composite_driver
- initialize configfs attribues via usb_function.group. It should containg
  everything that can be changed.

There are some fixes within the queue, like the bMaxPower fix on gadget side.
Not sure how important it is to push these things stable, don't know what Greg
does on host side.

Sebastian

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