x86: Fix deps of X86_UP_IOAPIC

Since commit 7cd92366
lAPIC enabled accidently the IOAPIC, which now gets fixed.

Signed-off-by: Henrik Kretzschmar <henne@nachtwindheim.de>
LKML-Reference: <1298385487-4708-5-git-send-email-henne@nachtwindheim.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>