Add libatomic to fix runtime error for clang build

Add libatomic to fix runtime error for clang build

This adds libatomic to fix following runtime error due to lack of
libatomic which is needed by clang-built chromium-efl.

>> dlopen error : libatomic.so.1: cannot open shared object file

Note that the libatomic is provided by rpm repository but it's not
included in platform image.

Reference:
1. https://review.tizen.org/gerrit/277412/
2. https://review.tizen.org/gerrit/277651/

Change-Id: I54aa9b83400ef8710127fdab2d236b9191261e83
Signed-off-by: Ayush Kumar <ayush.k123@samsung.com>