ACPICA: Update AML Debugger global variables.

ACPICA commit f65d0e5b880860a6da0c336b7c48139d1469f5b4

- Remove unused variables
- Update to use standard naming/capitalization convention.

Linux kernel is not affected by this patch.

Link: https://github.com/acpica/acpica/commit/f65d0e5b


Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>