mb/google/zork: Add signed verstage binaries & signature token

This adds signed PSP verstage binaries and AMD's signature token so that
the PSP can verify the signature.

BUG=b:165014175
TEST=Build and verify the signature token is present.
BRANCH=Zork

Signed-off-by: Martin Roth <martinroth@chromium.org>
Change-Id: Ie459ad47a77d31102dee708b4deb17bdea929f4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/blobs/+/2402249
Reviewed-by: Aaron Durbin <adurbin@google.com>
Tested-by: Martin Roth <martinroth@google.com>
Commit-Queue: Martin Roth <martinroth@google.com>
9 files changed