av: libstagefright: add EXYNOS4 support

imported from android-4.4

This is a squash commit

stagefright: add support for samsung proprietary omx

Change-Id: Ib453b6cc191d2adc2c14fb53525d0d3ba56c3653

exynos4: libstagefright: 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

Additional squashed commits from the same author:
omx: exynos4: bring inline with jellybean
libstagefright: exynos4: set proper eColorFormat

Change-Id: I269fd35279167f808b9bfd054a5d870c69e30544

Conflicts:
	media/libstagefright/ACodec.cpp
	media/libstagefright/Android.mk
	media/libstagefright/OMXCodec.cpp

Change-Id: I18c322eb358194b1cafb462411d725cb960b1fca