Resolve DNS64 hostname with Private DNS bypass

Test: as follows
    - builds
    - flashes
    - boots
    - runtest -x external/android-clat/clatd_test.cpp passes
Bug: 64133961
Bug: 72345192

Merged-In: I0b70f1655c9a202905a30838b002c9482898d506
Merged-In: I45214f0a04623012187168d9319babc98eb396de
Change-Id: If5238d0cdf27cb4cd689e1ff1ff776bc638d5a7b
(cherry picked from commit 0b1d19ca)