eo: fix efl_isa to work propertly with interfaces
mro only contains special interfaces, not in general all, in order to
have a working function, while NOT having a bad performance. In order to
achive that we just copy the code that is done on efl_isa for a object.
which is a linear walk of a list
Reviewed-by: SangHyeon Jade Lee <email@example.com>
Differential Revision: https://phab.enlightenment.org/D7860