wifi: iwlwifi: mvm: allocate STA links only for active links

wifi: iwlwifi: mvm: allocate STA links only for active links

For the mvm driver, data structures match what's in the firmware,
we allocate FW IDs for them already etc. During link switch we
already allocate/free the STA links appropriately, but initially
we'd allocate them always. Fix this to allocate memory, a STA ID,
etc. only for active links.

Fixes: 57974a55d995 ("wifi: iwlwifi: mvm: refactor iwl_mvm_mac_sta_state_common()")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240319100755.f2093ff73465.Ie891e1cc9c9df09ae22be6aad5c143e376f40f0e@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>