eo: propagate knowledge of EFL_EVENT_NOREF callback registration to the event call generation.

This reduce the amount of time efl_event_callback_call(EFL_EVENT_NOREF) is triggered by a factor of 10.

Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
Differential Revision: https://phab.enlightenment.org/D7744