wifi: iwlwifi: mld: support changing iftype at runtime

wifi: iwlwifi: mld: support changing iftype at runtime

While the interface isn't really operating, which is already
required by mac80211, we can simply remove the MAC and add
it again to change the type. Implement this simple handling.

We could almost consider moving this to mac80211 itself, as
this kind of flow should be supportable by any device, but
for now keep it here.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20260320100746.2fb530f9d825.I7cc68fa36e40c9f3bef3be9c2982061cb9ea2300@changeid