CameraService and Stagefright: Support AppOps

Camera:
- Signal to AppOpsService when camera usage starts and stops
- Listen to permissions revocations and act on them
- Currently just kill camera connection when permissions lost

Stagefright:
- Pass on client name, UID to camera as needed

Bug: 8181262
Change-Id: I9e33c9d05e9daa77dbb2d795045d08eb887ec8f0