ACPICA: iASL: Add definitions for the VIOT table

ACPICA commit fc4e33319c1ee08f20f5c44853dd8426643f6dfd

Add definitions for the VIOT table and its subtables.

Link: https://github.com/acpica/acpica/commit/fc4e3331


Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Kaneda <erik.kaneda@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>