string: ensure string included

Latest upstream yocto appears to have removed a free include of string.
This is causing compile failures for files which do not include it
properly.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: Ic1bf10e15071227582e5738336f632d33705c80b
diff --git a/item_updater.hpp b/item_updater.hpp
index 3a00afe..33dc05b 100644
--- a/item_updater.hpp
+++ b/item_updater.hpp
@@ -5,6 +5,7 @@
 #include "xyz/openbmc_project/Collection/DeleteAll/server.hpp"
 
 #include <sdbusplus/server.hpp>
+#include <string>
 #include <xyz/openbmc_project/Association/Definitions/server.hpp>
 #include <xyz/openbmc_project/Common/FactoryReset/server.hpp>
 #include <xyz/openbmc_project/Object/Enable/server.hpp>