Use templates for module population

Also add stddef.h workaround for old GCC.
RHEL-8 still uses GCC 8.5 and templates are not well supported.

Change-Id: Ia4dae23892ec63682ea848c46ba81de85cf6d209
Signed-off-by: Galantsev, Dmitrii <dmitrii.galantsev@amd.com>

server/src/rdc_server_main.cc

@@ -1,4 +1,3 @@
-
 /*
 Copyright (c) 2019 - present Advanced Micro Devices, Inc. All rights reserved.
 
@@ -222,7 +221,6 @@ void RDCServer::Run() {
   }
 
   // Finally assemble the server.
-  // std::unique_ptr<::grpc::Server> server(builder.BuildAndStart());
   server_ = builder.BuildAndStart();
 
   std::cout << "Server listening on " << server_address_.c_str() << std::endl;