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

[automerger skipped] Merge "Improve unique attestation docs & tests" into sc-dev am: afe9af04 am: 3b059d67 -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: I35e09899765c9509de1616a945f5f07af665fea8