[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/services/net/Android.bp b/services/net/Android.bp
index b0af599..6a871aa 100644
--- a/services/net/Android.bp
+++ b/services/net/Android.bp
@@ -18,3 +18,11 @@
         "java/android/net/netlink/*.java",
     ],
 }
+
+filegroup {
+    name: "services-tethering-shared-srcs",
+    srcs: [
+        ":framework-annotations",
+        "java/android/net/util/SharedLog.java"
+    ],
+}