Add stream-level suppression to vibrate/audio services.

- Add new audio restriction layer to app-ops.  Restrictions add
additional constraints to audio operations at a stream-level.
Restrictions do not affect the persistable state, and are purely
additive: that is, they can only impose additional contstraints, not
enable something that has already been disabled.  Restrictions
also support a whitelisted set of exempt package names.

- Add new audio stream-level checks to app-ops.

- Implement a provisional OP_PLAY_AUDIO suppression to three
java entry points MediaPlayer, AudioTrack, & SoundPool.

- Enhance vibrator api to take stream information as an optional
hint - the constants correspond to AudioManager stream types.
OP_VIBRATE now supports the stream-level restriction check.

- Simplify Vibrator subclasses by adding default implementations
for two .vibrate calls.

- Migrate NoMan's zen-mode control to use the new app-ops
stream-level restriction mechanism.

Change-Id: Ifae8952647202f728cf1c73e881452660c704678