Merge "Make pbtombstone a host tool." into main am: 539f39e6

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3005127



Change-Id: I0345ed6eb39aef7446d237feb3b2c56c67cefc6a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>