usb: cdns3: change "cdsn3" to"cdns3"

And delete cdsn3_hw_role_state_machine declare which doesn't
be needed.

Signed-off-by: Peter Chen <peter.chen@nxp.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Link: https://lore.kernel.org/r/20200331081005.32752-3-peter.chen@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>