WPS: Parse Request Type from WPS IE in (Re)AssocReq and derive mgmt keys

WPS: Parse Request Type from WPS IE in (Re)AssocReq and derive mgmt keys

WPS IE is now passed from hostapd association processing into EAP-WSC
and WPS processing. Request Type attribute is parsed from this
information and if the request is for a WLAN Manager Registrar,
additional management keys are derived (to be used with UPnP).