cyw43: Fix warning in event.rs.

Allow non_upper_case_globals, to prevent the compiler from spitting out a warning about the Event enum.

cyw43/src/events.rs

@@ -1,5 +1,5 @@
 #![allow(dead_code)]
-#![allow(non_camel_case_types)]
+#![allow(non_camel_case_types, non_upper_case_globals)]
 
 use core::cell::RefCell;