[AF_IUCV]: Fix compilation on s390-up

CC [M] net/iucv/iucv.o
net/iucv/iucv.c: In function 'iucv_init':
net/iucv/iucv.c:1556: error: 'iucv_cpu_notifier' undeclared (first use in this function)

Signed-off-by: Alexey Dobriyan <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/iucv/iucv.c

···
 	kfree(iucv_path_table);
 }
 
-#ifdef CONFIG_HOTPLUG_CPU
 static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
 				     unsigned long action, void *hcpu)
 {
···
 static struct notifier_block iucv_cpu_notifier = {
 	.notifier_call = iucv_cpu_notify,
 };
-#endif
 
 /**
  * iucv_sever_pathid