[automerger skipped] Add attestation certificate parsing and validate for IC vts. am: 57b3479394 -s ours am: 95b475661f -s ours am: 32d39ed05d -s ours

am skip reason: Change-Id Ibe770e6eaf0b0018d60876926d824204e4eaf732 with SHA-1 cab019aae5 is in history

Change-Id: I47b5c5be0bf5b8dd06227faa283f08a32d5ba1d8