Merge "identity: Fix attestation and documentation problems." am: d47c62b62a am: e727d997b6 am: bf17d87add am: aebd7132e4

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1475343

Change-Id: I6b7e4b2410bc46e9b500a577f270cc879194bb1d