[IA64] mca.c: make cpu hot add work again

Recent mca percpu changes broke a cpu being brought up after initial boot
which is required for cpu hotplug.  ia64_mca_cpu_init() must be __devinit
so it is not discarded in a hotplug kernel.
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/mca.c

@@ -1204,7 +1204,7 @@ static struct irqaction mca_cpep_irqaction = {
 
 /* Do per-CPU MCA-related initialization.  */
 
-void __init
+void __devinit
 ia64_mca_cpu_init(void *cpu_data)
 {
 	void *pal_vaddr;