mboxd: Rename flash files

Change-Id: Icfe9d61775a198c5a0f8227bf5d6c4b7f11aeec3
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/vpnor/test/write_ro.cpp b/vpnor/test/write_ro.cpp
index 53eeb18..f0dd215 100644
--- a/vpnor/test/write_ro.cpp
+++ b/vpnor/test/write_ro.cpp
@@ -10,7 +10,7 @@
 
 #include "common.h"
 #include "mbox.h"
-#include "mboxd_flash.h"
+#include "flash.h"
 
 #include "vpnor/test/tmpd.hpp"