Check firmware version more precisely

Apparently two different minor versions can have different API and
are not compatible with each other. Let's use more precise version
check so far to track which firmware has which API.

Signed-off-by: Eugene Krasnikov <k.eugene.e@gmail.com>
Store AID after association

Mac80211 is associated after BSS_CHANGED_ASSOC.
Store AID and use it everywhere.

Also fix rewriting bssid in smd_config_bss function
that caused config_sta to fail with error 5.

Signed-off-by: Eugene Krasnikov <k.eugene.e@gmail.com>