LinuxKPI: 802.11: add condition to TODO in ieee80211_sta_recalc_aggregates

ieee80211_sta_recalc_aggregates() shows up in TODO traces but there is
nothing we have to do there until we have active links (MLO support).
Make the TODO conditional for a time when we will get there.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days