VehicleManager: use with RefBase

RefBase with sp<>

Bug: 232557259
Test: build
Change-Id: Id6b3b7e222980fd0e82b2d94ff2518e92d42a4d9
diff --git a/automotive/vehicle/2.0/default/VehicleService.cpp b/automotive/vehicle/2.0/default/VehicleService.cpp
index 12e15f9..2968232 100644
--- a/automotive/vehicle/2.0/default/VehicleService.cpp
+++ b/automotive/vehicle/2.0/default/VehicleService.cpp
@@ -33,7 +33,7 @@
     auto store = std::make_unique<VehiclePropertyStore>();
     auto connector = std::make_unique<DefaultVehicleConnector>();
     auto hal = std::make_unique<DefaultVehicleHal>(store.get(), connector.get());
-    auto service = std::make_unique<VehicleHalManager>(hal.get());
+    auto service = android::sp<VehicleHalManager>::make(hal.get());
     connector->setValuePool(hal->getValuePool());
 
     android::hardware::configureRpcThreadpool(4, true /* callerWillJoin */);