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/fw-update/manager.hpp b/fw-update/manager.hpp
index 46a3285..0608a62 100644
--- a/fw-update/manager.hpp
+++ b/fw-update/manager.hpp
@@ -1,10 +1,10 @@
 #pragma once
 
 #include "activation.hpp"
+#include "common/instance_id.hpp"
 #include "common/types.hpp"
 #include "device_updater.hpp"
 #include "inventory_manager.hpp"
-#include "pldmd/instance_id.hpp"
 #include "requester/handler.hpp"
 #include "update_manager.hpp"