knownnetworks: Add UPDATED event

If a known network is modified on disk known networks does not have
any way of notifying other modules. This will be needed to support a
corner case in DPP if a profile exists but is overwritten after DPP
configuration. Add this event to known networks and handle it in
network.c (though nothing needs to be done in that case).

src/knownnetworks.c

@@ -468,6 +468,10 @@ void known_network_update(struct network_info *network,
 	known_network_set_autoconnect(network, new->is_autoconnectable);
 
 	memcpy(&network->config, new, sizeof(struct network_config));
+
+	WATCHLIST_NOTIFY(&known_network_watches,
+				known_networks_watch_func_t,
+				KNOWN_NETWORKS_EVENT_UPDATED, network);
 }
 
 bool known_networks_foreach(known_networks_foreach_func_t function,

src/knownnetworks.h

@@ -35,6 +35,7 @@ struct network_info;
 enum known_networks_event {
 	KNOWN_NETWORKS_EVENT_ADDED,
 	KNOWN_NETWORKS_EVENT_REMOVED,
+	KNOWN_NETWORKS_EVENT_UPDATED,
 };
 
 struct network_info_ops {

src/network.c

@@ -2033,6 +2033,8 @@ static void known_networks_changed(enum known_networks_event event,
 	case KNOWN_NETWORKS_EVENT_REMOVED:
 		station_foreach(emit_known_network_removed, (void *) info);
 		break;
+	case KNOWN_NETWORKS_EVENT_UPDATED:
+		break;
 	}
 }