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/host-bmc/dbus_to_event_handler.hpp b/host-bmc/dbus_to_event_handler.hpp
index 87668c2..846f210 100644
--- a/host-bmc/dbus_to_event_handler.hpp
+++ b/host-bmc/dbus_to_event_handler.hpp
@@ -1,7 +1,7 @@
 #pragma once
 
+#include "common/instance_id.hpp"
 #include "libpldmresponder/pdr_utils.hpp"
-#include "pldmd/instance_id.hpp"
 #include "requester/handler.hpp"
 
 #include <libpldm/platform.h>