writefrudata: add missing header: map

Add missing header map to add to standard namespace.

Change-Id: I719fd0d194cb6fd8fa2e67f8acb784b498cf122a
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/writefrudata.cpp b/writefrudata.cpp
index a831b7f..6373416 100644
--- a/writefrudata.cpp
+++ b/writefrudata.cpp
@@ -14,6 +14,7 @@
 #include <exception>
 #include <fstream>
 #include <iostream>
+#include <map>
 #include <memory>
 #include <phosphor-logging/log.hpp>
 #include <sdbusplus/server.hpp>