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 --cc arch/x86/kernel/apic.c
Simple merge

diff --cc arch/x86/kernel/io_apic.c
Simple merge

diff --cc arch/x86/kernel/smpboot.c
Simple merge