Merge "Clarified that USER_IDENTIFICATION_ASSOCIATION is optional." into rvc-dev am: b35c0cd4 am: 4ba2b85a am: 6de13a46

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/11796048

Change-Id: Iacb6356b7f3d1fbac0916e67f836fc90f2a44787