Handle downstream tethering interface addresses in MdnsSocketProvider

MdnsSocketProvider currently does not fill addresses of downstream
tethering interfaces in its callbacks. The interface addresses should be
properly updated by listening to the Netlink messages.

Test: atest FrameworksNetTests CtsNetTestCases
Bug: 267980538
Change-Id: I753e547a1b092703fe59c6c9e922ee8aca245f67
6 files changed