[automerger skipped] Merge "Improve unique attestation docs & tests" into...

[automerger skipped] Merge "Improve unique attestation docs & tests" into sc-dev am: afe9af04 -s ours am: 661b9d73 -s ours am: 62a19154 -s ours

am skip reason: Merged-In I09bb16d6938b567c114485d2df00bde9d3e1ccf9 with SHA-1 90747ad7 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/14985780

Change-Id: Iac1837e7ff8c79e23c76274ddf0cb01ab4fd4ee3