hostapd: Require EAPOL-Key type to match with selected protocol

hostapd: Require EAPOL-Key type to match with selected protocol

Previously, we would have allowed both the WPA and RSN EAPOL-Key
types to be used regardless of whether the association is using
WPA or RSN/WPA2. This shouldn't result in any significant problems
on the Authenticator side, but anyway, we should check the type and
ignore the EAPOL-Key frames that used unexpected type.