Merge "Update low battery level for advance bluetooth device" into rvc-dev

public class AdvancedBluetoothDetailsHeaderController extends BasePreferenceController implements

        LifecycleObserver, OnStart, OnStop, OnDestroy, CachedBluetoothDevice.Callback {

    private static final String TAG = "AdvancedBtHeaderCtrl";

    private static final int LOW_BATTERY_LEVEL = 20;

    private static final int LOW_BATTERY_LEVEL = 15;

    @VisibleForTesting

    LayoutPreference mLayoutPreference;