Merge "Get RDNSS option information from kernel instead of Netd." am: f3dd8d71df am: 1f1881ac6f

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/1737438

Change-Id: I1f00c25a6a8b9157d19fcd2f3417d642a9f3f0a6