Add support for Greybus CPort flags that are sent to the bridge through
a new USB vendor request when enabling a CPort as part of connection
establishment.
Currently the Greybus control and high-priority connection flags are
recognised and forwarded to APBA.
Reviewed-by: Alex Elder <elder@linaro.org> Signed-off-by: Johan Hovold <johan@hovoldconsulting.com> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>