greybus: greybus_protocol: remove unused lights macros

Greybus core now handle the _INVALID and PROTOCOL_VERSION types, so no
need to have specific protocol macros for this. Just drop them.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>