[NETD-TC#14] Add traffic controller JNI to tethering module

This CL provides native methods to access BPF maps via a native library.

Bug: 202086915
Test: m; flash; boot;
Change-Id: I2e5d03d0c2e31ba11996d1b28ead9b552397fe29
diff --git a/Tethering/apex/Android.bp b/Tethering/apex/Android.bp
index 72c83fa..611f100 100644
--- a/Tethering/apex/Android.bp
+++ b/Tethering/apex/Android.bp
@@ -51,7 +51,8 @@
         first: {
             jni_libs: [
                 "libservice-connectivity",
-                "libcom_android_connectivity_com_android_net_module_util_jni"
+                "libcom_android_connectivity_com_android_net_module_util_jni",
+                "libtraffic_controller_jni",
             ],
         },
         both: {