Remove ResolveUtil from frameworks/base callers

Use the Private DNS bypass logic that was moved into Network.

Once all callers of ResolvUtil are updated to use this interface
ResolvUtil can be deleted.

Test: as follows
    - built, flashed, booted
    - runtest frameworks-net passes
    - connection to captive portal network detects portal correctly
      and the login activity functions as expected

Bug: 64133961
Bug: 72345192
Bug: 73872000
Bug: 78548486

Change-Id: If11ef2b5ffdc729f8449cf18dccd5f1eccbc51e6