x86: apic: Remove duplicated macros

XAPIC_DEST_* is dupliicated to the one in apicdef.h

[ Impact: cleanup ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <49F552D0.5050505@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>