Sync ACPICA with Intel's version 20160729.

Sync ACPICA with Intel's version 20160729.

* Restructured and standardized the C library configuration for
  ACPICA.

* AML interpreter: Allows for execution of so-called "executable"
  AML code outside of control methods, not just at the module level
  (top level) but also within any scope declared outside of a
  control method - Scope{}, Device{}, Processor{}, PowerResource{},
  and ThermalZone{}. Lv Zheng.

* iASL: Add full support for the RASF ACPI table (RAS Features Table).

* iASL: Allows for compilation/disassembly of so-called "executable"
  AML code (see above).

For a more detailed list, please see sys/contrib/dev/acpica/changes.txt.