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/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index f54408d..8a33698 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -76,7 +76,7 @@
 extern cpumask_t cpus_in_sr;
 static inline int kexec_sr_activated(int cpu)
 {
-	return cpu_isset(cpu,cpus_in_sr);
+	return cpumask_test_cpu(cpu, &cpus_in_sr);
 }
 
 struct kimage;