mboxd: Rename windows files

Change-Id: I44e110906fd0f751f8f34b175f971e65896a7301
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/control.c b/control.c
index 92ad21e..eff4f7e 100644
--- a/control.c
+++ b/control.c
@@ -8,7 +8,7 @@
 #include "flash.h"
 #include "lpc.h"
 #include "mboxd_msg.h"
-#include "mboxd_windows.h"
+#include "windows.h"
 
 int control_ping(struct mbox_context *context)
 {