Merge tag 'android-5.1.0_r1' into HEAD

Android 5.1.0 release 1

Conflicts:
	cmds/atrace/atrace.cpp
	include/media/openmax/OMX_Audio.h
	services/surfaceflinger/Layer.cpp
	services/surfaceflinger/Layer.h
	services/surfaceflinger/SurfaceFlinger.cpp
	services/surfaceflinger/SurfaceFlinger.h

Change-Id: I090bc3c6d46cb853289b449b2e5f234ff950437d