Merge branch 'acpica'
ACPICA update to upstream revision 20180531 (including an important
AML parser fix and updates related to IORT) and a change to start
responding to the "Windows 2017.2" _OSI string.
* acpica:
ACPICA: Recognize the _OSI string "Windows 2017.2"
ACPICA: Update version to 20180531
ACPICA: Interpreter: Begin deprecation of Unload operator
ACPICA: AML parser: attempt to continue loading table after error
ACPICA: Debugger: Reduce verbosity for module-level code errors.
ACPICA: AML Parser: Add debug option to dump parse trees
ACPICA: Debugger: Add count of namespace nodes after namespace dump
ACPICA: IORT: Add PMCG node supprt
ACPICA: IORT: Update for revision D