Attest: Create Instance ID in symmetric Initial Attestation

Calculate the Instance ID based on symmetric IAK when IAK raw data
is fetched.
Implement attest_add_instance_id_claim() to construct the Instance
ID claim for symmetric algorithm based Initial Attestation.

Change-Id: I4d5d3aa935ce08d2c5a6e9132274d36d9e28b78c
Signed-off-by: David Hu <david.hu@arm.com>
3 files changed