ACPICA: Add support for new SRAT subtable

ACPICA commit 5bc67f63918da249bfe279ee461d152bb3e6f55b

GIC ITS Affinity (ACPI 6.2)

Link: https://github.com/acpica/acpica/commit/5bc67f63


Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>