Change OWNERS of dlmalloc to the ART team am: 6664178542 am: c3be842f2f

Original change: https://android-review.googlesource.com/c/platform/external/dlmalloc/+/2146801

Change-Id: I7f9b9114cd67d13794032a5b91b848a222322a3d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>