Move netlink_listener_test into TrafficControllerTest

netlink_listener_test tests the socket destroy listener, so it makes
sense to just merge it into the TrafficControllerTest.

Test: atest traffic_controller_unit_test
Change-Id: Ibc0b483203150aa2d7898a761fa4715dce6f4218
diff --git a/service/native/Android.bp b/service/native/Android.bp
index 0e805e2..a20c54f 100644
--- a/service/native/Android.bp
+++ b/service/native/Android.bp
@@ -70,6 +70,7 @@
         "libnetdutils",
         "libtraffic_controller",
         "libutils",
+        "libnetd_updatable",
         "netd_aidl_interface-lateststable-ndk",
     ],
 }