iwm_abort_notification_waits() is dead code: the device stop path never aborts pending notification waits, leaving control threads stalled for their full bounded timeout during firmware stop/restart

Summary

The abort walker is defined+declared but has zero call sites - iwm_stop_device and every fw-restart path never set wait_entry->aborted, so in-flight waiters stall up to their full timeout (<=2*hz) instead of aborting promptly. The upstream iwlwifi design this mirrors invokes the abort on transport stop. Wire-into-stop fix.