InstanceIdDb: Move header from pldmd/ to common/

The header is used across all executables produced by the project, which
makes it "common".

Change-Id: I022b179fad1de8dba2ef39fd33bc240ec73a2d33
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/pldmd/pldmd.cpp b/pldmd/pldmd.cpp
index f58540e..da50615 100644
--- a/pldmd/pldmd.cpp
+++ b/pldmd/pldmd.cpp
@@ -1,8 +1,8 @@
 #include "common/flight_recorder.hpp"
+#include "common/instance_id.hpp"
 #include "common/utils.hpp"
 #include "dbus_impl_requester.hpp"
 #include "fw-update/manager.hpp"
-#include "instance_id.hpp"
 #include "invoker.hpp"
 #include "requester/handler.hpp"
 #include "requester/mctp_endpoint_discovery.hpp"