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

Conflicts:

	media/libstagefright/ACodec.cpp
	media/libstagefright/OMXCodec.cpp

cherry pick from 906eba9f

Change-Id: I1c174f8e9fa9bd3ed16a0399f070b6680f6a331c