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>