[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
diff --git a/staticlibs/native/bpf_headers/Android.bp b/staticlibs/native/bpf_headers/Android.bp
index 06ba1b0..8426dce 100644
--- a/staticlibs/native/bpf_headers/Android.bp
+++ b/staticlibs/native/bpf_headers/Android.bp
@@ -45,6 +45,7 @@
         "//frameworks/native/services/gpuservice/tracing",
         "//packages/modules/Connectivity/bpf_progs",
         "//packages/modules/Connectivity/netd",
+        "//packages/modules/Connectivity/service/native",
         "//packages/modules/Connectivity/tests/unit/jni",
         "//packages/modules/DnsResolver/tests",
         "//system/bpf/bpfloader",