Merge "Refactor RouterAdvertisementDaemon with FdEventsReader" into main am: 093433c8b8

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2493357

Change-Id: I8c9f9b58d65f79a74008483a80b3b0e684087bbf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>