Merge "Rewrite RKP readme in terms of DICE" am: 139b663e38 am: e8821b0fd6

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2597060

Change-Id: Idd6c002a6930778a0c2d874481820177ecd02f1c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>