vboot: remove Boot Descriptor Block (BDB) library and utilities

Remove unused BDB code, previously created for a cancelled SoC
project.

BUG=b:124141368, chromium:986177
TEST=make clean && make runtests
BRANCH=none

Change-Id: I91faf97d9850f8afb816fa324ad9a4d9f3842888
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1710336
Tested-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
62 files changed