usb: device_next: hid: Pass request buffer in input report done

Pass the report buffer originally provided in hid_device_submit_report()
as a parameter to input_report_done() callback. Example use case is to
enable HID report multi buffering which is easiest achieved by
allocating report buffer before submitting it and then releasing the
buffer after it has been sent.

Signed-off-by: Tomasz Moń <tomasz.mon@nordicsemi.no>