Declare example HAL as virtual instance.

Bug: 228638448
Test: manual (see README.md)
Change-Id: I4c00b9e394eb7863416b61662528869f7e70c09d
diff --git a/biometrics/fingerprint/aidl/default/main.cpp b/biometrics/fingerprint/aidl/default/main.cpp
index c985201..0e672b1 100644
--- a/biometrics/fingerprint/aidl/default/main.cpp
+++ b/biometrics/fingerprint/aidl/default/main.cpp
@@ -27,7 +27,7 @@
     ABinderProcess_setThreadPoolMaxThreadCount(0);
     std::shared_ptr<Fingerprint> hal = ndk::SharedRefBase::make<Fingerprint>();
 
-    const std::string instance = std::string(Fingerprint::descriptor) + "/default";
+    const std::string instance = std::string(Fingerprint::descriptor) + "/virtual";
     binder_status_t status = AServiceManager_addService(hal->asBinder().get(), instance.c_str());
     CHECK_EQ(status, STATUS_OK);