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.

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1754027

Merged-In: I59e5bae433a51f626cf962e27c008e77b8eed4fd
(cherry picked from commit 8ae26dfe)

Change-Id: I30efbf6bef66d42b6e053b7066af3af318b44818