Add toggle in menu to show/hide hidden apps

In the previous cl we hide unrelated apps and distribute hidden
battery usage among other apps. Now we add a toggle in menu to
show old power accounting as well.

Bug: 35366708
Test: RunSettingsRoboTests
Change-Id: I6918b7095cf84d9756ad3972ff50a62aeae1de0e

src/com/android/settings/fuelgauge/PowerUsageFeatureProviderImpl.java

@@ -43,4 +43,9 @@ public class PowerUsageFeatureProviderImpl implements PowerUsageFeatureProvider
     public boolean isTypeService(String[] packages) {
         return false;
     }
+
+    @Override
+    public boolean isPowerAccountingToggleEnabled() {
+        return false;
+    }
 }