audioflinger: fix duplicating thread output buffers clear

Also clear mix buffer in DuplicatingThread::threadLoop_mix()
instead of just sink buffer when output threads are not
ready.

Bug: 18262127.
Change-Id: I4c22bbeaccdcc8d7c10c5882dde3439eb73d6ede
(cherry picked from commit 02b5708776ba2a9b4ff8c09008483aef7dbe38c7)
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
libstagefright: back off exynos4 hacks

Change-Id: I953f502171bc98854b5d59165057c57b3c65cdaa
libstagefright: align YV12 for software codecs on exynos4

YV12 chroma stide should be aligned to 16 according to the
android framework. But, GSC & Mali couldn't accept a seperate
stride for U & V components. They just use Y_stride/2 as a
UV Stride.

Change-Id: Ibeeb3439ee10a4666420e5fa34ff0a6d6ea7c003
libstagefright: fix YV12 stride for software codecs on exynos4

Change-Id: I3612899d2bffa474eb6447788858911757a7f45d
omx: exynos4: bring inline with jellybean

Change-Id: Ic275fd30a721f8161dcc44c2706b86ab5ea213ba