ACPICA: Linux Header: Remove unused OSL prototypes.

This patch removes 2 useless OSL prototypes as they are not used by Linux now.

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>