Fix problems when psk-mixed
Seems on some platforms we hit issue where driver generate probe_resp without all required AKMs. Then hostapd generate 3/4 EAP frame with all AKMs.
After that client often reject authentication with reason=17 (IE_IN_4WAY_DIFFERS).
Disable MFP for psk-mixed before we will fix it in the driver.
Signed-off-by: Janusz Dziedzic janusz.dziedzic@iopsys.eu