[Cherry-pick] Move AttributionNode out of atoms.proto am: 42c90919cd

Original change: https://android-review.googlesource.com/c/platform/frameworks/proto_logging/+/3451630

Change-Id: I92543dceb5c29956f67606a20788ae11ff76859c
Signed-off-by: Automerger Merge Worker <[email protected]>
tree: 374b7c0f56fdd7599885abd1bd032a20199abe17
  1. stats/
  2. OWNERS