Split threadnetwork_extension_atoms into 2 files (content is not changed), in which threadnetwork_atoms contains only our own ATOM definition, so that we can link it in our binary.

Bug: 230565248
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a874dda98a6e9fbf10a752c6caf43b6b3339dc49)
Merged-In: I9c18b4ba1f7a728b94e93f824ef1d5cb04e7fa4e
Change-Id: I9c18b4ba1f7a728b94e93f824ef1d5cb04e7fa4e
3 files changed
tree: c137b1030f67af8f9049be84c8080e08d2a9b274
  1. stats/
  2. OWNERS