Merge "[mtectrl] Add more comments" am: 42a0836654

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2279707

Change-Id: I66b874619bf8825ad03c93657cf939a7b0ebd13a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>