mboxd: Rename flash files

Change-Id: Icfe9d61775a198c5a0f8227bf5d6c4b7f11aeec3
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/mboxd.c b/mboxd.c
index d04daf4..6ebe596 100644
--- a/mboxd.c
+++ b/mboxd.c
@@ -31,7 +31,7 @@
 #include "common.h"
 #include "dbus.h"
 #include "control_dbus.h"
-#include "mboxd_flash.h"
+#include "flash.h"
 #include "mboxd_lpc.h"
 #include "mboxd_msg.h"
 #include "mboxd_windows.h"