Sync ACPICA with Intel's version 20160527.

Sync ACPICA with Intel's version 20160527.

* Temporarily reverted the new arbitrary bit length/alignment support
  in AcpiHwRead/AcpiHwWrite for the Generic Address Structure. There
  have been a number of regressions with the new code that need to be
  fully resolved and tested before this support can be finally
  integrated into ACPICA. Apologies for any inconveniences these
  issues may have caused.

* The ACPI message macros are not configurable (ACPI_MSG_ERROR,
  ACPI_MSG_EXCEPTION, ACPI_MSG_WARNING, ACPI_MSG_INFO,
  ACPI_MSG_BIOS_ERROR, and ACPI_MSG_BIOS_WARNING). Lv Zheng.

* Fixed a couple of GCC warnings associated with the use of the
  -Wcast-qual option. Adds a new return macro, return_STR.
  Jung-uk Kim.

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