Change OWNERS of dlmalloc to the ART team am: 6664178542

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

Change-Id: I5dfc7df35905a0c1c363632f6a275b8e79f5ca76
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>