Use SocketKey in MdnsServiceCache am: 775840e1b4 am: 2fbd1459b7 am: 4c1e75a22b am: 9fd8f4b227

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2648319

Change-Id: I0982f365dbcaa9ef9ce982b7bcc66df284318fb6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>