Flush secondary device types on FLUSH command

This makes it possible to clear previously configured secondary device
types.

Signed-hostap: Jouni Malinen <j@w1.fi>

wpa_supplicant/ctrl_iface.c

@@ -5261,6 +5261,7 @@ static void wpa_supplicant_ctrl_iface_flush(struct wpa_supplicant *wpa_s)
 	wpas_p2p_service_flush(wpa_s);
 	wpa_s->global->p2p_disabled = 0;
 	wpa_s->global->p2p_per_sta_psk = 0;
+	wpa_s->conf->num_sec_device_types = 0;
 #endif /* CONFIG_P2P */
 
 #ifdef CONFIG_WPS_TESTING