[EFL] Remove Intel Wk2 Buildbots from Master
https://bugs.webkit.org/show_bug.cgi?id=116149

Removing Intel maintained EFL Wk2 bots except the handle for efl-linux-slave-2
since Gyuyoung Kim from Samsung plans to take over and maintain it.

Reviewed by Benjamin Poulain.

* BuildSlaveSupport/build.webkit.org-config/config.json:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150181 268f45cc-cd09-0410-ab3c-d52691b4dbfc