atspi: make highlight frame be a smart member

atspi: make highlight frame be a smart member

Make highlight frame object be a smart member of target object.
There are two cases covered by this commit.

1. ctxpopup of copy & paste module.
The ctxpopup item has higher object layer than highlight frame object.
In this case, the highlight frame is covered by the ctxpopup item.

2. genlist item proxy object.
The genlist item shows its proxy object(handled by evas_object_image_source*).
In this case, the highlight frame has improper position, and size.

Change-Id: I2b6470a8a695ea3739ddf80832e837dbd2c0d1f8