Consitently use dbus::utility types

This saves about 4k on the binary size

Tested: Redfish service validator passes.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I9546227a19c691b1aecb80e80307889548c0293f
diff --git a/redfish-core/lib/cable.hpp b/redfish-core/lib/cable.hpp
index 05da5f6..241baf4 100644
--- a/redfish-core/lib/cable.hpp
+++ b/redfish-core/lib/cable.hpp
@@ -1,5 +1,5 @@
 #pragma once
-#include <boost/container/flat_map.hpp>
+#include <dbus_utility.hpp>
 #include <utils/json_utils.hpp>
 
 namespace redfish