Sync ACPICA with Intel's version
20150515.
General changes:
* Runtime argument checking and return value checking for all new
ACPI 6.0 predefined names.
iasl(8) and other tools specific changes:
* Added support for all new ACPI 6.0 predefined names and tables and
for changes to existing tables (FADT, MADT).
* Added a new directive to enable inclusion of binary objects into
ASL code, #includebinary.
* Add support for all new ACPI 6.0 predefined names to acpihelp(8).
* Add new options -d (display iASL preprocessor directives) and
-t (display all known/supported ACPI tables) to acpihelp(8).
For a more detailed list, please see sys/contrib/dev/acpica/changes.txt.