KM module may consume less input than provided by finish time.

Keymaster1 HAL permits the implementation of "update" operation to
leave some input unconsumed by the time "finish" operation neeeds to
be invoked. This needs to be treated as "invalid input" error rather
than a "can't happen" exception.

This CL was confirmed to fix the issue by the vendor who encountered
the issue.

Bug: 22512100
Change-Id: Ibb1a37d58f650d03605612559a154ce2416d147c