exynos4: Add open source libsecion.

This libsecion is reverse engineered from the libsecion.so blob and then
written based on the Exynos 5 libion available in AOSP.

Change-Id: Ibe69047c78491e3c7f3173b18fcabdf327fcfbd0
Signed-off-by: angelsl <hidingfromhidden@gmail.com>