Migrate to new sound trigger middleware service

This change:
- Removes the old ISoundTriggerHw service and removes its code.
- Connects AudioPolicyManager to the new service via AIDL RPC (using
  a new utility, BinderProxy).

Change-Id: I00366e2c5f252708e903b2311816d9eceb132a05
Bug: 142070343
29 files changed