ACPICA: Fix divergences of the commit - ACPICA: Expose OSI version.

The original commit 242b2287 "ACPICA:
expose OSI version" triggers build errors in ACPICA when it is back
ported.  The patch removes the divergences between Linux and upstream
ACPICA resulting from that.

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