powerpc: Rework interrupt_init_cpu()

The function interrupt_init_cpu() is given an int return type but does
not return anything but 0.  Rework this to be a void function.

Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Mario Six <mario.six@gdsys.cc>
diff --git a/arch/powerpc/include/asm/ppc.h b/arch/powerpc/include/asm/ppc.h
index 850fe93..5e0aa08 100644
--- a/arch/powerpc/include/asm/ppc.h
+++ b/arch/powerpc/include/asm/ppc.h
@@ -122,7 +122,7 @@
 void print_reginfo(void);
 #endif
 
-int interrupt_init_cpu(unsigned *);
+void interrupt_init_cpu(unsigned *);
 void timer_interrupt_cpu(struct pt_regs *);
 unsigned long search_exception_table(unsigned long addr);