iwlwifi: make bcast LQ command available for later restore actions

When adding the broadcast station the link quality command is
generated on demand, sent to device, and disappears. It is thus not
available for later cases when we need to restore stations and need
to send the link quality command afterwards. Now, when first adding the
broadcast station, also generate its link quality command to always be
available for later restoring.

Also fix an issue when adding local stations where the "in progress" state
is never cleared.

Reported-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>