Merge "Clarified that USER_IDENTIFICATION_ASSOCIATION is optional." into rvc-dev am: b35c0cd494 am: 4ba2b85a44 am: 6de13a469c am: 8495d43132

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

Change-Id: Ifbb7802793e0669fafd875da41343d8414d07a4c