Import the MdnsConstants and MdnsRecord am: 9f737d0842

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/23528307

Change-Id: Id14a68f324c12b16415d92e08bf3b0822ecd45e6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>