ACPICA termination: Clear debug buffer global.

Prevent possible multiple deletion of a debugger buffer.
ACPICA BZ 1010. Tomasz Nowicki <tomasz.nowicki@linaro.org>.
ACPICA Termination: Delete global lock pending lock.

Add deletion of this lock, used for the global lock.
ACPICA BZ 1012. Tomasz Nowicki <tomasz.nowicki@linaro.org>