[MIPS] SMTC: Fix modpost warning.

WARNING: vmlinux.o(.text+0xcf54): Section mismatch: reference to .init.text:smp_bootstrap (between 'smtc_boot_secondary' and 'ipi_interrupt')

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/smtc.c b/arch/mips/kernel/smtc.c
index 6b3c3ea..16aa5d3 100644
--- a/arch/mips/kernel/smtc.c
+++ b/arch/mips/kernel/smtc.c
@@ -524,7 +524,7 @@
  * (unsigned long)idle->thread_info the gp
  *
  */
-void smtc_boot_secondary(int cpu, struct task_struct *idle)
+void __cpuinit smtc_boot_secondary(int cpu, struct task_struct *idle)
 {
 	extern u32 kernelsp[NR_CPUS];
 	long flags;