mboxd: Rename mboxd_msg to transport_mbox

Change-Id: I0f4e206648c02a98fa938a7e582470c8d90904f1
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/windows.c b/windows.c
index 1842108..26fd37b 100644
--- a/windows.c
+++ b/windows.c
@@ -27,7 +27,7 @@
 
 #include "mbox.h"
 #include "common.h"
-#include "mboxd_msg.h"
+#include "transport_mbox.h"
 #include "windows.h"
 #include "flash.h"