Initialize mAddExtraTestVendorConfigs to false.

If we do not init, the initial value is undefined.

Test: Local run
Bug: 340947823
Flag: EXEMPT bugfix
Change-Id: I18a3688a446dd969545e1fc2cb5f63210c3c02cd
Merged-In: I18a3688a446dd969545e1fc2cb5f63210c3c02cd
diff --git a/automotive/vehicle/aidl/impl/fake_impl/hardware/include/FakeVehicleHardware.h b/automotive/vehicle/aidl/impl/fake_impl/hardware/include/FakeVehicleHardware.h
index 8cd92b3..d986b41 100644
--- a/automotive/vehicle/aidl/impl/fake_impl/hardware/include/FakeVehicleHardware.h
+++ b/automotive/vehicle/aidl/impl/fake_impl/hardware/include/FakeVehicleHardware.h
@@ -182,7 +182,7 @@
     std::unordered_set<int32_t> hvacPowerDependentProps;
 
     const bool mForceOverride;
-    bool mAddExtraTestVendorConfigs;
+    bool mAddExtraTestVendorConfigs = false;
 
     // Only used during initialization.
     JsonConfigLoader mLoader;