Implement hidden VEHICLE_MAPS_SERVICE API.

This is the first stage of the VMS API refactoring. This change
introduces the new API as a hidden API with clients and state
independent from the existing API.

It will be followed by a change to wrap the existing API around the new
interface.

Bug: 148239208
Test: atest AndroidCarApiTest CarServiceTest CarServiceUnitTest
Change-Id: Idbb26327e7cc23023475112980c453ac5fd37a61
diff --git a/service/src/com/android/car/CarFeatureController.java b/service/src/com/android/car/CarFeatureController.java
index 1e8a5c5..b9a1cce 100644
--- a/service/src/com/android/car/CarFeatureController.java
+++ b/service/src/com/android/car/CarFeatureController.java
@@ -87,6 +87,7 @@
             CarFeatures.FEATURE_CAR_USER_NOTICE_SERVICE,
             Car.DIAGNOSTIC_SERVICE,
             Car.STORAGE_MONITORING_SERVICE,
+            Car.VEHICLE_MAP_SERVICE,
             Car.VMS_SUBSCRIBER_SERVICE
     ));