Android10.0 SystemUI 去掉状态栏wifi流量上下行图标

  在10.0定制SystemUI 状态栏上显示时钟，电池电量 wifi图标，在显示wifi图标时,网络实时更新时，但是会时不时显示上下行图标 显得很不美观，客户需求要求不显示上下行图标
所以需要去掉上下行图标

   frameworksbasepackagesSystemUIsrccomandroidsystemuistatusbarphoneStatusBar.java
   frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarSignalPolicy.java

StatusBar创建的创建过程中
 public class StatusBar extends SystemUI implements DemoMode,
        ActivityStarter, OnUnlockMethodChangedListener,
        OnHeadsUpChangedListener, CommandQueue.Callbacks, ZenModeController.Callback,
        ColorExtractor.OnColorsChangedListener, ConfigurationListener,
        StatusBarStateController.StateListener, ShadeController,
        ActivityLaunchAnimator.Callback, AmbientPulseManager.OnAmbientChangedListener,
        AppOpsController.Callbac