WPS: Notify about WPS PBC event in Enrollee mode

Previously, the event "WPS-PBC-ACTIVE" was only generated when
wpa_supplicant is operating as WPS Registrar whereas "WPS-SUCCESS" or
"WPS-TIMEOUT" are generated for both, the Registrar and the Enrollee
roles.

Also generate the event when wpa_supplicant is operating as WPS Enrollee
to allow monitoring the begin and the end of a WPS PBC process.

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>

wpa_supplicant/wps_supplicant.c

@@ -1168,6 +1168,7 @@ int wpas_wps_start_pbc(struct wpa_supplicant *wpa_s, const u8 *bssid,
 		return -1;
 	if (wpa_s->wps_fragment_size)
 		ssid->eap.fragment_size = wpa_s->wps_fragment_size;
+	wpa_supplicant_wps_event(wpa_s, WPS_EV_PBC_ACTIVE, NULL);
 	eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wpas_wps_timeout,
 			       wpa_s, NULL);
 	wpas_wps_reassoc(wpa_s, ssid, bssid, 0);