x86: make 32bit to call enable_IO_APIC early like 64bit

Impact: cleanup

So we remove some #ifdefs.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index af57f88..1083495 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1154,13 +1154,12 @@
 	 */
 	setup_local_APIC();
 
-#ifdef CONFIG_X86_64
 	/*
 	 * Enable IO APIC before setting up error vector
 	 */
 	if (!skip_ioapic_setup && nr_ioapics)
 		enable_IO_APIC();
-#endif
+
 	end_local_APIC_setup();
 
 	map_cpu_to_logical_apicid();