USB: serial: cp210x: drop unnecessary packed attributes

Drop unnecessary packed attributes from structs without padding.

Link: https://lore.kernel.org/r/20200713105517.27796-5-johan@kernel.org


Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>