wifi: iwlwifi: update the BA notification API

We don't use the new field, but at least, document the change.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20240625194805.3d7887e2e374.I37bf709969d069ff0392e0976e62e06fb7a87bc9@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>