[automerger skipped] Add attestation certificate parsing and validate for IC vts. am: 38ca6961e3 am: c7b50fed50 am: 80194c8163 -s ours

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

Change-Id: I66a40aa6963e07edcadddf85621534717ecf54b1