vboot: remove unused PublicKey and Signature helper functions

Functions are replaced by their vboot2 equivalents:

  GetPublicKeyData --> vb2_packed_key_data
  GetSignatureData --> vb2_signature_data
  VerifyPublicKeyInside --> vb2_verify_packed_key_inside
  VerifySignatureInside --> vb2_verify_signature_inside

BUG=b:124141368, chromium:968464
TEST=make clean && make runtests
BRANCH=none

Change-Id: Idcae0510070242315bdcd843f29d0662ed0ea3ad
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1786387
Tested-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
2 files changed