Slices feature supports firmware version.

- Migrate FirmwareVersionPreferenceController to BasePreferenceController class.
- Because slices feature needs an unique uri,
  we should avoid same firmware key in my_device_info.xml and device_info_settings.xml.
- Modify test case for new firmware version controller.

Test: slice uri > content://android.settings.slices/intent/my_device_firmware_version
Test: make RunSettingsRoboTests -j
      atest UniquePreferenceTest SettingsGatewayTest
Change-Id: If516bbdb3ddb823db9909123ef694a2beaf5dc66

src/com/android/settings/deviceinfo/DeviceInfoSettings.java

@@ -53,6 +53,12 @@ public class DeviceInfoSettings extends DashboardFragment implements Indexable {
     @VisibleForTesting
     static final int NON_SIM_PREFERENCES_COUNT = 2;
 
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        use(FirmwareVersionPreferenceController.class).setHost(this /*parent*/);
+    }
+
     @Override
     public int getMetricsCategory() {
         return MetricsEvent.DEVICEINFO;
@@ -130,7 +136,6 @@ public class DeviceInfoSettings extends DashboardFragment implements Indexable {
         controllers.add(new SimStatusPreferenceController(context, fragment));
         controllers.add(new DeviceModelPreferenceController(context, fragment));
         controllers.add(new ImeiInfoPreferenceController(context, fragment));
-        controllers.add(new FirmwareVersionPreferenceController(context, fragment));
         controllers.add(new IpAddressPreferenceController(context, lifecycle));
         controllers.add(new WifiMacAddressPreferenceController(context, lifecycle));
         controllers.add(new BluetoothAddressPreferenceController(context, lifecycle));