Usama: have a sample from a real TEE

[ounsworth]

Intel SGX, or others (Usama will comment with more).

[muhammad-usama-sardar]

As mentioned in IETF meeting 120, add at least one of the following:

• Intel SGX
• Intel TDX
• Arm CCA
• AMD SEV-SNP
• IBM PEF
• RISC-V CoVE