Merge "Document expectations of DICE mode" am: ebcdcdbc03

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2583537

Change-Id: I83d72bd6ab9a622e2edc39b463ffad5245845a8c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>