[automerger skipped] Add attestation certificate parsing and validate for IC vts. am: 38ca6961e3 am: c7b50fed50 -s ours am: d4acfe5da7 -s ours

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

Change-Id: Idd25e7609b27c3ae1d1d3ae63803a40dcb88238c