Fix testRawQueryNXDomain in DnsResolverTest

This test can not pass in T-Mobile Network becauseT-Mobile
has configured their network to return a "search page" when
the user looks up a name that doesn't exist.
Enable private DNS before doing nxDomain test.

Bug: 144521720
Test: atest MultinetworkApiTest
Change-Id: Ib4ef0843ebad0a897150d2bc30386b51126deeb4
1 file changed
tree: e313fbc355b7bddc671bdb6da0dda44f0b3512d8
  1. tests/