Check if link stats are supported when reporting activity info

    public WifiActivityEnergyInfo getControllerActivityEnergyInfo(int updateType) {

        if (mService == null) return null;

        try {

            WifiActivityEnergyInfo record;

            if (!isEnhancedPowerReportingSupported()) {

                return null;

            }

            synchronized(this) {

                record = mService.reportActivityInfo();

                if (record != null && record.isValid()) {

                    return record;

                } else {

                    return null;

                }

                return mService.reportActivityInfo();

            }

        } catch (RemoteException e) {

            Log.e(TAG, "getControllerActivityEnergyInfo: " + e);