ACPICA: Remove incorrect "static" from a global structure

ACPICA commit 7a9956a2afd3863fa7d9fe4a64a957389d09f3c2

Reported by Colin Ian King. ACPICA BZ 1239.

Link: https://github.com/acpica/acpica/commit/7a9956a2
Link: https://bugs.acpica.org/show_bug.cgi?id=1239


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>