[automerger skipped] Add PRIVATE_DNS_MODE setting setter am: 5dfacdee51 am: f8215991ca am: f7b4e3d070 -s ours

am skip reason: skip tag Change-Id If234426f041606c4881de1eca31b6f5bdb3c6bfe with SHA-1 37135512f8 is already in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1654014

Change-Id: I75eaedbfd00428cad87e5398c1f3bd54f0dbcd43