Spin off DnsPacket into separate library am: 190060950e

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1853704

Change-Id: I4d95df169e55304ffb04a896409dde1896f90c26
tree: 51544b3c4ee87dde75f91546dd0d0ae52c7eccda
  1. staticlibs/