powerpc/pmac/smp: Rename fixup_irqs() to migrate_irqs() and use it on ppc32

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index be7d728..f6cc5c1 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -317,8 +317,8 @@
 	set_cpu_online(cpu, false);
 #ifdef CONFIG_PPC64
 	vdso_data->processorCount--;
-	fixup_irqs(cpu_online_mask);
 #endif
+	migrate_irqs();
 	return 0;
 }