Add missing headers

Most of these were found by breaking every redfish class handler into
its own compile unit:

When that's done, these missing headers become compile errors. We
should just fix them.

In addition, this allows us to enable automatic header checking in
clang-tidy using misc-header-cleaner. Because the compiler can now
"see" all the defines, it no longer tries to remove headers that it
thinks are unused.

[1] https://github.com/openbmc/bmcweb/commit/4fdee9e39e9f03122ee16a6fb251a380681f56ac

Tested: Code compiles.

Change-Id: Ifa27ac4a512362b7ded7cc3068648dc4aea6ad7b
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/redfish-core/lib/thermal.hpp b/redfish-core/lib/thermal.hpp
index 7e840d2..84bf37a 100644
--- a/redfish-core/lib/thermal.hpp
+++ b/redfish-core/lib/thermal.hpp
@@ -19,6 +19,7 @@
 #include "query.hpp"
 #include "registries/privilege_registry.hpp"
 #include "sensors.hpp"
+#include "utils/json_utils.hpp"
 
 namespace redfish
 {