powerpc: Convert old cpumask API into new one

Adapt new API.

Almost change is trivial. Most important change is the below line
because we plan to change task->cpus_allowed implementation.

-       ctx->cpus_allowed = current->cpus_allowed;

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index e49b799..2164006 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -1452,7 +1452,7 @@
 	unsigned int associativity[VPHN_ASSOC_BUFSIZE] = {0};
 	struct sys_device *sysdev;
 
-	for_each_cpu_mask(cpu, cpu_associativity_changes_mask) {
+	for_each_cpu(cpu,&cpu_associativity_changes_mask) {
 		vphn_get_associativity(cpu, associativity);
 		nid = associativity_to_nid(associativity);