Convert LazyServiceRegistrar usage to singleton

Test: lshal
Bug: 139376253
Change-Id: I32cb803fb73aa15b52676847b6e7eb09b86657dc
diff --git a/wifi/1.3/default/service.cpp b/wifi/1.3/default/service.cpp
index fcbc37c..0b41d28 100644
--- a/wifi/1.3/default/service.cpp
+++ b/wifi/1.3/default/service.cpp
@@ -58,7 +58,7 @@
             std::make_shared<WifiIfaceUtil>(iface_tool),
             std::make_shared<WifiFeatureFlags>());
     if (kLazyService) {
-        LazyServiceRegistrar registrar;
+        auto registrar = LazyServiceRegistrar::getInstance();
         CHECK_EQ(registrar.registerService(service), android::NO_ERROR)
             << "Failed to register wifi HAL";
     } else {