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

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

Change-Id: I7b883b170c264993a6cf8386ff908b26c568b727