[automerge] Refactor the InetSocketAddress in MulticastPacketReader to use port zero 2p: b9b1d0a9e8

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/22917594

Bug: 279691736
Change-Id: I738e6d3ebae191578db287d77f4b03fe674b8681
Merged-In: Idb9d8a96e1f10eb2ede972125430c84af6b539d9