hostap: Fix WPA version for WPA3 and WPA2-PSK-256

The WPA version was only been set for WPA-PSK and WPA2-PSK, but for
others it wasn't set. For AP mode this causes issues as WPA-IE is
considered and WPA3/WPA2-PSK-256 aren't allowed, they need RSN.

Explicitly set the version for all to RSN, except for WPA-PSK.

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