Allow prebuilted apks
Unsecure by default
Deodexed build
Don't build AOSP Music app

Change-Id: If1f62434a759ebd7a279d20c8328530981770f82
Remove HomeSample from builds

As good as it looks, we already have a launcher (Launcher3)

Change-Id: I87cac70eec30fd62d6f7ecb7777caa9d240fe0ee