Merge "Disallow fastboot to modify locked DSU" into main am: 66b68dde92

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2744993

Change-Id: I39173cd7c8b05cf9724e585808c78ab50c7bae0d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>