iwlwifi: mvm: remove card state notification code

This notification ID was actually used for something else we
never implemented, but luckily we only had some debug code
here. Just remove it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211219132536.a67b5b9db259.Ic55b306fcd2a3525b3993f4b7e00622dd95053ba@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>