Merge "Add extra help for dumpsys meminfo --unreachable, --logstats" into main...

Merge "Add extra help for dumpsys meminfo --unreachable, --logstats" into main am: f740e50a am: bb7f4f03

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



Change-Id: I6690ed8a234ebcb472ae6fe7f31763edbc0da271
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>