mboxd: Rename flash files

Change-Id: Icfe9d61775a198c5a0f8227bf5d6c4b7f11aeec3
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/control.c b/control.c
index 39099d3..72245d7 100644
--- a/control.c
+++ b/control.c
@@ -5,7 +5,7 @@
 
 #include "dbus.h"
 #include "mbox.h"
-#include "mboxd_flash.h"
+#include "flash.h"
 #include "mboxd_lpc.h"
 #include "mboxd_msg.h"
 #include "mboxd_windows.h"