Delete the unused netlink-client lib from service.net.

This cl also paves the path for netlink-client lib migration, after
moving the netlink-client library to frameworks/libs/net/common and
build it as an individual library, deprecate the netlink-client lib
and use net-utils-device-common-netlink instead.

Bug: 192535368
Test: atest FrameworksNetTests
Change-Id: Iad91562d56c503399230e1fe6a635db68e07541d