exynos4: libstragefright: add support for samsung colorformat/omx/mfc

Source:
http://git.insignal.co.kr/samsung/exynos/android/platform/frameworks/av/commit/?h=exynos-jb&id=1614612f7ca2a00473d202dbedcb135fadc608ad

Change-Id: Ib40b3cfa1480ecbb69831e7967a81f63719e2ff7

Conflicts:
	media/libstagefright/ACodec.cpp