Merge tag 'android-6.0.0_r26' into HEAD

Android 6.0.0 release 26

Conflicts:
	core/Makefile
	core/build_id.mk
	tools/releasetools/ota_from_target_files.py

Change-Id: Ia1404ee9cd931a6540ea0dd3e2aa7b32d649e80c