[Tether02] Migrate TetheringConfiguration into module

TetheringConfiguration is a utility class to encapsulate the various
configuration elements.

Bug: 136040414
Test: -build, flash, boot
      -atest TetheringTests

Change-Id: I9434ab213bc5e0fca59f14a6c8cea554abefc3a4
diff --git a/tests/net/Android.bp b/tests/net/Android.bp
index beb5e0d..b9b2238 100644
--- a/tests/net/Android.bp
+++ b/tests/net/Android.bp
@@ -44,7 +44,11 @@
 android_test {
     name: "FrameworksNetTests",
     defaults: ["FrameworksNetTests-jni-defaults"],
-    srcs: ["java/**/*.java", "java/**/*.kt"],
+    srcs: [
+        ":tethering-tests-src",
+        "java/**/*.java",
+        "java/**/*.kt",
+    ],
     platform_apis: true,
     test_suites: ["device-tests"],
     certificate: "platform",