Add a new CTS test for DCL read-only enforcement am: d3a8a9e960

Original change: https://android-review.googlesource.com/c/platform/art/+/2299577

Change-Id: I8e4f8c60910f70ae3467c91627cb42eda4856fc4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>