hostap: Fix handling channel 14

Channel 14 in JP is still allowed (though OFDM is disabled), this wasn't
handled by operating class 81, so, add 82 to the list.

We still need to full implement regulatory support in the WPA
supplicant but that is handled in separate fix.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>
Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>