Update the VTS module according to the refactoring in aosp/2826571

Test: atest VtsAidlAuthGraphRoleTest, atest VtsAidlAuthGraphSessionTest
Change-Id: I6cc3bd17952f602b58668d35e09c6a5385c7de61
diff --git a/security/authgraph/default/src/main.rs b/security/authgraph/default/src/main.rs
index 873eb4e..81f2dd6 100644
--- a/security/authgraph/default/src/main.rs
+++ b/security/authgraph/default/src/main.rs
@@ -65,7 +65,8 @@
     binder::ProcessState::start_thread_pool();
 
     // Register the service
-    let local_ta = LocalTa::new();
+    let local_ta =
+        LocalTa::new().map_err(|e| format!("Failed to create the TA because: {e:?}"))?;
     let service = service::AuthGraphService::new_as_binder(Arc::new(Mutex::new(local_ta)));
     let service_name = format!("{}/{}", SERVICE_NAME, SERVICE_INSTANCE);
     binder::add_service(&service_name, service.as_binder()).map_err(|e| {