hostap: Fix WPA-PSK handling

WPA-PSK was added a bit late, so, it wasn't properly implemented, use
both key management and protocol version to properly handle WPA-PSK in
both connection and also in the status.

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