mboxd: Rename windows files

Change-Id: I44e110906fd0f751f8f34b175f971e65896a7301
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/mboxd_msg.c b/mboxd_msg.c
index 5d92960..5eae6d6 100644
--- a/mboxd_msg.c
+++ b/mboxd_msg.c
@@ -27,7 +27,7 @@
 #include "mbox.h"
 #include "common.h"
 #include "mboxd_msg.h"
-#include "mboxd_windows.h"
+#include "windows.h"
 #include "lpc.h"
 
 /*