arch_topology: Warn that topology for nested clusters is not supported

We don't support the topology for clusters of CPU clusters while the
DT and ACPI bindings theoritcally support the same. Just warn about the
same so that it is clear to the users of arch_topology that the nested
clusters are not yet supported.

Link: https://lore.kernel.org/r/20220704101605.1318280-21-sudeep.holla@arm.com
Tested-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

drivers/base/arch_topology.c

@@ -567,6 +567,8 @@ static int __init parse_cluster(struct device_node *cluster, int package_id,
 		if (c) {
 			leaf = false;
 			ret = parse_cluster(c, package_id, i, depth + 1);
+			if (depth > 0)
+				pr_warn("Topology for clusters of clusters not yet supported\n");
 			of_node_put(c);
 			if (ret != 0)
 				return ret;