Merge "AppOpsService: Fix de-dup for change records on OpModeWatchers." into rvc-dev am: 43799554

        if (callbacks == null) {

            callbacks = new HashMap<>();

        }

        boolean duplicate = false;

        final int N = cbs.size();

        for (int i=0; i<N; i++) {

            ModeCallback cb = cbs.valueAt(i);

            ArrayList<ChangeRec> reports = callbacks.get(cb);

            boolean duplicate = false;

            if (reports == null) {

                reports = new ArrayList<>();

                callbacks.put(cb, reports);