Merge "Add extra help for dumpsys meminfo --unreachable, --logstats" into main am: f740e50a2b

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3048327

Change-Id: I36a0d9887cb6bf60b127a6767cbc57c6a6d91eee
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>