This patch added X2APIC support. It is to enable the case when
APIC ID is greater than 255. This patch only handle core wakeup
portion. Platform still needs to handle ACPI related changes for
X2APIC.
X2APIC lib is backward compatible with XAPIC lib. So there is no
need to use XAPIC lib anymore.
Signed-off-by: Maurice Ma <maurice.ma@intel.com>