ACPI: add support for x2APIC ACPI extensions

ACPI: add support for x2APIC ACPI extensions

All logical processors with APIC ID values of 255 and greater will
have their APIC reported through Processor X2APIC structure (type-9
entry type) and all logical processors with APIC ID less than 255 will
have their APIC reported through legacy Processor Local APIC (type-0
entry type) only. This is the same case even for NMI structure
reporting.

The Processor X2APIC Affinity structure provides the association
between the X2APIC ID of a logical processor and the proximity domain
to which the logical processor belongs.

This patch adds 2 new subtables to MADT and one new subtable to SRAT.

This patch also changes x86_acpiid_to_apicid from u8 to u32 for x2APIC
ID, and changes mp_register_lapic to accept 32-bit id. But there are
still some 8-bit apic id hardcode and assumptions in Xen code, it
needs to be fixed in future.

Signed-off-by: Weidong Han <weidong.han@intel.com>