Fix clang-tidy misc-definitions-in-headers warnings am: 564c1978 am: 2cf44356

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2314066



Change-Id: I116deef39a0daf996d8ec1e68c849b2faba05c00
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>