wl18xx: allow using 40Mhz AP in 2.4Ghz for testing

Print a more modest error and avoid the WARN_ON. It should be enough to
detect this on a user setup.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
wlcore: AP-mode - recover security seq num for stations

Save the sequence number of the broadcast AP link in the wlvif. For each
connected station, save the sequence number in the drv_priv part of
ieee80211_sta. Use the saved numbers on recovery/resume, with the
obligatory increment on recovery.

Signed-off-by: Arik Nemtsov <arik@wizery.com>