mboxd: Rename flash files

Change-Id: Icfe9d61775a198c5a0f8227bf5d6c4b7f11aeec3
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/vpnor/pnor_partition.cpp b/vpnor/pnor_partition.cpp
index 67a24f4..7961194 100644
--- a/vpnor/pnor_partition.cpp
+++ b/vpnor/pnor_partition.cpp
@@ -3,7 +3,7 @@
 #include "pnor_partition.hpp"
 #include "pnor_partition_table.hpp"
 #include "config.h"
-#include "mboxd_flash.h"
+#include "flash.h"
 #include "mboxd_pnor_partition_table.h"
 #include "xyz/openbmc_project/Common/error.hpp"
 #include <phosphor-logging/log.hpp>