Updating grpc to 1.31.1 for cpp

Change-Id: I0e904d76eacfaddc4f1af598d7d076142dc492c3
diff --git a/cpp/dmi/hw.grpc.pb.cc b/cpp/dmi/hw.grpc.pb.cc
index c74b1e5..99096fc 100644
--- a/cpp/dmi/hw.grpc.pb.cc
+++ b/cpp/dmi/hw.grpc.pb.cc
@@ -5,14 +5,20 @@
 #include "dmi/hw.pb.h"
 #include "dmi/hw.grpc.pb.h"
 
-#include <grpc++/impl/codegen/async_stream.h>
-#include <grpc++/impl/codegen/async_unary_call.h>
-#include <grpc++/impl/codegen/channel_interface.h>
-#include <grpc++/impl/codegen/client_unary_call.h>
-#include <grpc++/impl/codegen/method_handler_impl.h>
-#include <grpc++/impl/codegen/rpc_service_method.h>
-#include <grpc++/impl/codegen/service_type.h>
-#include <grpc++/impl/codegen/sync_stream.h>
+#include <functional>
+#include <grpcpp/impl/codegen/async_stream.h>
+#include <grpcpp/impl/codegen/async_unary_call.h>
+#include <grpcpp/impl/codegen/channel_interface.h>
+#include <grpcpp/impl/codegen/client_unary_call.h>
+#include <grpcpp/impl/codegen/client_callback.h>
+#include <grpcpp/impl/codegen/message_allocator.h>
+#include <grpcpp/impl/codegen/method_handler.h>
+#include <grpcpp/impl/codegen/rpc_service_method.h>
+#include <grpcpp/impl/codegen/server_callback.h>
+#include <grpcpp/impl/codegen/server_callback_handlers.h>
+#include <grpcpp/impl/codegen/server_context.h>
+#include <grpcpp/impl/codegen/service_type.h>
+#include <grpcpp/impl/codegen/sync_stream.h>
 namespace dmi {
 
 }  // namespace dmi