Add attestation certificate parsing and validate for IC vts.

 - Added attestation certificate parsing support.
 - Added various certificate conversion support.
 - Added certification verification support.
 - Added tests for the attestation certificate verification.
 - Updated the old tests to use the new attestation validation
   implementation.
 - Updated GenerateReaderCertificate to use pointer reader private key.

Bug: 154909726
Test: VtsHalIdentityTargetTest
Test: atest android.security.identity.cts
Merged-In: Ibe770e6eaf0b0018d60876926d824204e4eaf732
Change-Id: I07c2eaf92ed60fa31761816c4b45684806c3305e