Merge "Fix mtectrl usage message." am: 7281994c12

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2089305

Change-Id: I50eacddaa351a649186a0402d3f5131f5ad11cb3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>