atspi: do not accept ELM_ATSPI_ROLE_IMAGE_MAP

atspi: do not accept ELM_ATSPI_ROLE_IMAGE_MAP

There are two widgets using ELM_ATSPI_ROLE_IMAGE_MAP role.
One is elm_mapbuf which does not have to grab highlight.
It does not make sense because the elm_mapbuf only works for its content.
The other is elm_map. So far the elm_map does not have to grab highlight, and
it seems that the ELM_ATSPI_ROLE_IMAGE_MAP is improper role for elm_map.
We have to find proper role for elm_map when it is neccesary to grab highlight.
So this patch set would be reasonable.

Change-Id: I8fc82c8f278b12f1e6367f4e40bf6b37c44b1481