If provided the extra entropy will be added to the device before calling finish. If entropy is provided and the device does not support supplying additional entropy then finish will fail with KM_ERROR_UNIMPLEMENTED. (cherry-picked from commit 9ce30624a448f439e19960d0dd88103c04676e7d) Change-Id: If26be118bf382604f6f8e96e833b76e6f9e94d58