Merge driver ops set_wps_beacon_ie and set_wps_probe_resp_ie

set_ap_wps_ie() is not used to set WPS IE for both Beacon and Probe
Response frames with a single call. In addition, struct wpabuf is used
instead of separate u8* and length fields. This avoids duplicated
allocation of the IEs and simplifies code in general.

src/drivers/driver_ndis.c

@@ -3242,8 +3242,7 @@ const struct wpa_driver_ops wpa_driver_ndis_ops = {
 	NULL /* set_radius_acl_auth */,
 	NULL /* set_radius_acl_expire */,
 	NULL /* set_ht_params */,
-	NULL /* set_wps_beacon_ie */,
-	NULL /* set_wps_probe_resp_ie */,
+	NULL /* set_ap_wps_ie */,
 	NULL /* set_supp_port */,
 	NULL /* set_wds_sta */
 };