ACPICA: Linux: add support for X32 ABI compilation

X32 follows ILP32 model. Check for ILP32 as well when checking for
x86_64 to ensure the defines are correct for X32 ABI.

Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>