fix cancellation hanging on event never occuring

- The end event is not triggered by stop and might therefor never occur
- Clear the end_event after operation is done instead of disabled

embassy-nrf/src/radio/ble.rs

@@ -347,12 +347,10 @@ impl<'d, T: Instance> Radio<'d, T> {
             trace!("radio drop: stopping");
 
             r.intenclr.write(|w| w.end().clear());
-            r.events_end.reset();
 
             r.tasks_stop.write(|w| unsafe { w.bits(1) });
 
-            // The docs don't explicitly mention any event to acknowledge the stop task
-            while r.events_end.read().bits() == 0 {}
+            r.events_end.reset();
 
             trace!("radio drop: stopped");
         });
@@ -382,7 +380,7 @@ impl<'d, T: Instance> Radio<'d, T> {
         .await;
 
         compiler_fence(Ordering::SeqCst);
-        r.events_disabled.reset(); // ACK
+        r.events_end.reset(); // ACK
 
         // Everthing ends fine, so it disable the drop
         drop.defuse();