[EFL] Bump required version of EFL to 1.7
https://bugs.webkit.org/show_bug.cgi?id=119144

Reviewed by Christophe Dumez.

.:

We have supported 1.6 for Tizen build since r137203.
But Tizen now supports 1.7+ after Tizen released 2.0.

* Source/cmake/OptionsEfl.cmake:
Bumped EFL to 1.7 and removed promotion.

Source/WebCore:

* platform/efl/FileSystemEfl.cpp: Removed workaround code which was fixed at Eina 1.7
(WebCore::listDirectory):

Tools:

* MiniBrowser/efl/CMakeLists.txt: Bumped EFL to 1.7


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153409 268f45cc-cd09-0410-ab3c-d52691b4dbfc