elm: Fixed genlist/gengrid callback function pointer typedef name. Follow EFL's naming

elm: Fixed genlist/gengrid callback function pointer typedef name. Follow EFL's naming
convention. Elm_{widget}_{callback_name}_Cb. I will remove deprecated
typedefs a week later.

GridItemLabelGetFunc -> Elm_Gengrid_Item_Label_Get_Cb
GridItemIconGetFunc -> Elm_Gengrid_Item_Icon_Get_Cb
GridItemStateGetFunc -> Elm_Gengrid_Item_State_Get_Cb
GridItemDelFunc -> Elm_Gengrid_Item_Del_Cb

GenlistItemLabelGetFunc -> Elm_Genlist_Item_Label_Get_Cb
GenlistItemIconGetFunc -> Elm_Genlist_Item_Icon_Get_Cb
GenlistItemStateGetFunc -> Elm_Genlist_Item_State_Get_Cb
GenlistItemDelFunc -> Elm_Genlist_Item_Del_Cb

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/elementary@62272 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33