dmabuf_dump: Remove per-device and attachment stats am: 87b63e5cbc am: 6717070cb5 am: 117cc10ba8

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/memory/libmeminfo/+/15263763

Change-Id: Ic2b69cc475a12173582486e90b4a8110475b0548