vboot: remove workbuf alloc and free code

Workbuf should be allocated and free'd by vboot caller.

BUG=b:124141368, chromium:951692
TEST=make clean && make runtests
CQ-DEPEND=CL:1563872
BRANCH=none

Change-Id: Ibaa70f62c660d46cc083a5e55a73b961eb813649
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1560716
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>
3 files changed