Log AppOp access events in DiscreteRegistry

For a selected list of AppOps, log their access events(note, start, finish,
pause, resume) in DiscreteRegistry.

Flag: EXEMPT log only update
Bug: 365584286
Test: Run `statsd_testdrive 931` and operate device to trigger log
event, verify event is properly logged.

Change-Id: I82882742b222709916e5811032c0037dd3bf2a50
5 files changed