update SystemUI's proguard.flags

-keep class com.android.systemui.statusbar.tablet.TabletStatusBarService {

  public void notificationIconsClicked(android.view.View);

  public void systemInfoClicked(android.view.View);

  public void recentButtonClicked(android.view.View);

  public void toggleLightsOut(android.view.View);

}

-keep class com.android.systemui.statusbar.policy.KeyButtonView {

  public float getDrawingAlpha();

  public float getGlowAlpha();