Add optional additional entropy to finish
Chad Brubaker authored
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 8cfb8ac6)

Change-Id: If26be118bf382604f6f8e96e833b76e6f9e94d58
0d33e0ba