[EFL] Bump version of ATK used by jhbuild to 2.15.2
https://bugs.webkit.org/show_bug.cgi?id=139816

Reviewed by Gyuyoung Kim.

Bump version of ATK used by jhbuild to 2.15.2

* efl/jhbuild.modules:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@177822 268f45cc-cd09-0410-ab3c-d52691b4dbfc