transport: mbox: Rename free_mbox_dev to transport_mbox_free

Change-Id: Ie400ccfada8890ddc626deadabd58fe4bf4c3cd3
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/transport_mbox.h b/transport_mbox.h
index 8dd5902..c9d494d 100644
--- a/transport_mbox.h
+++ b/transport_mbox.h
@@ -9,6 +9,6 @@
 
 int transport_mbox_dispatch(struct mbox_context *context);
 int transport_mbox_init(struct mbox_context *context);
-void free_mbox_dev(struct mbox_context *context);
+void transport_mbox_free(struct mbox_context *context);
 
 #endif /* MBOXD_MSG_H */