Eran Messeri a9ce01cfed Improve unique attestation docs & tests
Improve the documentation and tests related to device-unique
attestation on StrongBox KeyMint devices:
* Test that the chain produced is exactly of length 2.
* Document how the chain needs to be structured.
* Explain the trust properties of the key used for the
  self-signed root.

Test: atest VtsAidlKeyMintTargetTest
Bug: 187803288
Ignore-AOSP-First: Already merged in AOSP
Merged-In: I09bb16d6938b567c114485d2df00bde9d3e1ccf9
Change-Id: Ib7efdd428ce5a2e14c281077e3a77048c9721702
2021-06-16 14:41:18 +01:00
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2020-12-16 18:09:12 +00:00
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