Merge "keymint: document deprecation of UNLOCKED_DEVICE_REQUIRED enforcement" into main am: 8c7558625f am: 1438394ac9

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2966026

Change-Id: I9cb9e8b2cf36fc8c60c0ff78a0a1f591f61ad4a1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>