cryptohome, attestation: add IFX CA 50 to known CAs

Add IFX TPM EK Intermediate CA 50 to the list of known certification
authorities for verifying cros-core endorsement certificates.

BUG=b:76210800
TEST="tpm-manager verify_endorsement --cros_core" succeeds on a device
     with the TPM that has EKcert signed by this CA

Change-Id: I81084547355a039000bb153295e77f74a24dc85c
Reviewed-on: https://chromium-review.googlesource.com/979266
Commit-Ready: Andrey Pronin <apronin@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
(cherry picked from commit 2ee6d9afc9a994324561ca1423546c64a21c59b4)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2162353
Reviewed-by: Chinyue Chen <chinyue@chromium.org>
Commit-Queue: Chinyue Chen <chinyue@chromium.org>
Tested-by: Chinyue Chen <chinyue@chromium.org>
1 file changed