buildjson: Reduce include scope as needed

Change-Id: I8dfa600680fb253cd828f284ff217f35f76c0b46
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/bmc/firmware-handler/firmware_handlers_builder.cpp b/bmc/firmware-handler/firmware_handlers_builder.cpp
index d5f029c..13bfd69 100644
--- a/bmc/firmware-handler/firmware_handlers_builder.cpp
+++ b/bmc/firmware-handler/firmware_handlers_builder.cpp
@@ -17,6 +17,7 @@
 
 #include "file_handler.hpp"
 #include "fs.hpp"
+#include "general_systemd.hpp"
 #include "skip_action.hpp"
 
 #include <nlohmann/json.hpp>