wifi: mac80211: allow rate_control_rate_init() for links

wifi: mac80211: allow rate_control_rate_init() for links

Andrei previously fixed an issue in the client where the NSS
for links other than the primary/assoc/deflink isn't set. The
same issue appears to exist on the AP side, because there's
only a call to rate_control_rate_init() for the deflink, and
not any other links.

Rework the code a bit to do rate_control_rate_init() for links,
even if it really doesn't work with software rate control yet,
it does other things as well.

Also add rate_control_rate_init_all_links() to actually do it
properly when moving to ASSOC state in cfg80211.

Change the explicit call to ieee80211_sta_init_nss() to instead
be rate_control_rate_init() now in the client code, but also
add a call to rate_control_rate_init() when a link is added in
AP mode and the STA is already associated.

This should fix the NSS initialization issue, and perhaps pave
the way for actual software rate scaling a bit, in case anyone
cares in the future, but that of course needs a lot more than
just the init call.

We still need to fix the rate control _update_ as well, and the
sta_rc_update() driver method especially, but that will be in a
different patch.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20241007144851.c693274a908f.I0376da02e9f5a30eaa1b5d0d01371ff09506d453@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>