service: Auto stub fallback

For simple services we can implement an automatic stub fallback to help with compatibility until a proper implementation is done.

Co-Authored-By: Chloe <25727384+ognik5377@users.noreply.github.com>

src/core/hle/service/service.cpp

@@ -146,6 +146,10 @@ void ServiceFrameworkBase::ReportUnimplementedFunction(Kernel::HLERequestContext
     system.GetReporter().SaveUnimplementedFunctionReport(ctx, ctx.GetCommand(), function_name,
                                                          service_name);
     UNIMPLEMENTED_MSG("Unknown / unimplemented {}", fmt::to_string(buf));
+
+    LOG_WARNING(Service, "Using auto stub fallback!");
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
 }
 
 void ServiceFrameworkBase::InvokeRequest(Kernel::HLERequestContext& ctx) {