Extend panel max slice number to six

Bug: 147332809
Test: make -j50 RunSettingsRoboTests
Change-Id: I523af9ba1b2bd172cb544bf7d6ddb15f5f9d5aef

src/com/android/settings/panel/PanelSlicesAdapter.java

@@ -51,7 +51,7 @@ public class PanelSlicesAdapter
      * Maximum number of slices allowed on the panel view.
      */
     @VisibleForTesting
-    static final int MAX_NUM_OF_SLICES = 5;
+    static final int MAX_NUM_OF_SLICES = 6;
 
     private final List<LiveData<Slice>> mSliceLiveData;
     private final int mMetricsCategory;