power subsystem: fix header

Added the logging header.

Tested: code compiles.

Signed-off-by: Nan Zhou <nanzhoumails@gmail.com>
Change-Id: Ie707780e195766b37a3d307818615c6be36d424e
diff --git a/redfish-core/lib/power_subsystem.hpp b/redfish-core/lib/power_subsystem.hpp
index c3b898c..90559ef 100644
--- a/redfish-core/lib/power_subsystem.hpp
+++ b/redfish-core/lib/power_subsystem.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "app.hpp"
+#include "logging.hpp"
 #include "query.hpp"
 #include "registries/privilege_registry.hpp"
 #include "utils/chassis_utils.hpp"