greybus: greybus_protocols: remove control-protocol version

Remove control-protocol version from the exported protocol definitions
as it is an implementation detail that makes no sense to export.

Currently gbsim uses the kernel's control-protocol version definitions
directly instead of reporting the version of the protocol it actually
implements.

Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>