Merge "Clarified that USER_IDENTIFICATION_ASSOCIATION is optional." into rvc-dev am: b35c0cd494 am: cf9aeeee17 am: 8288f88e75

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

Change-Id: Ia9736712d8dbb475af0a2173d1f1a831dcde03bc