manifest: track android-visualizer

Change-Id: I52f8457c074c633b322d50bd8d7e04280b5547b6
Signed-off-by: Roman Birg <roman@cyngn.com>
Add FFMPEG and stagefright-plugins to the project

Change-Id: Iec58ed53f953304d8b78fd7561548fa771b33349