[NETD-TC#12] Fix dependency on libtraffic_controller

1. Add visibility for libtraffic_control
2. Add com.android.tethering into apex_available statement

Bug: 202086915
Test: m; flash; boot
Change-Id: I817e22c24dd205f09ef62a2a7ff85b2a970f6d3a
3 files changed
tree: 838664c8a3c82dc352de5ee8343d00879c4a0da1
  1. staticlibs/