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: I07495fc1f98c70756e416afd99764842d7223a36
Signed-off-by: angelsl <hidingfromhidden@gmail.com>