add missing header: map

Change-Id: I453bad9fa811934daea59fdb9a2cc51524403783
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/ipmi_fru_info_area.hpp b/ipmi_fru_info_area.hpp
index 7faca98..9fe0107 100644
--- a/ipmi_fru_info_area.hpp
+++ b/ipmi_fru_info_area.hpp
@@ -1,4 +1,6 @@
 #pragma once
+
+#include <map>
 #include <string>
 #include <vector>