s390/smp: fix section mismatch for smp_add_present_cpu()

Fixes this section mismatch:

WARNING: vmlinux.o(.text+0x145e4): Section mismatch in reference from the function
   smp_add_present_cpu() to the function .cpuinit.text:register_cpu()
The function smp_add_present_cpu() references
the function __cpuinit register_cpu().
This is often because smp_add_present_cpu lacks a __cpuinit
annotation or the annotation of register_cpu is wrong.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/smp.c

@@ -623,9 +623,10 @@ static struct sclp_cpu_info *smp_get_cpu_info(void)
 	return info;
 }
 
-static int smp_add_present_cpu(int cpu);
+static int __cpuinit smp_add_present_cpu(int cpu);
 
-static int __smp_rescan_cpus(struct sclp_cpu_info *info, int sysfs_add)
+static int __cpuinit __smp_rescan_cpus(struct sclp_cpu_info *info,
+				       int sysfs_add)
 {
 	struct pcpu *pcpu;
 	cpumask_t avail;
@@ -985,7 +986,7 @@ static int __cpuinit smp_cpu_notify(struct notifier_block *self,
 	return notifier_from_errno(err);
 }
 
-static int smp_add_present_cpu(int cpu)
+static int __cpuinit smp_add_present_cpu(int cpu)
 {
 	struct cpu *c = &pcpu_devices[cpu].cpu;
 	struct device *s = &c->dev;