Add explicit override for default Private DNS mode

Test: as follows
    - built
    - flashed
    - booted
    - runtest frameworks-net passes
Bug: 79719289
Change-Id: I943c5476666e47d04690626e2133f501cb875b46
3 files changed
tree: 8dfe1fed30ae191a127ce6d58732f594ec521330
  1. core/
  2. services/
  3. tests/