[Tether09] Add RouteUtils and NetdUtils

Add RouteUtils and NetdUtils file to NetworkStack module shared
folder. And it would statically linked into framework and
tethering module.

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

Change-Id: I8c2781597b410d12407ddb743f1621bf92d2a852
diff --git a/common/moduleutils/Android.bp b/common/moduleutils/Android.bp
index 6117149..afd82e5 100644
--- a/common/moduleutils/Android.bp
+++ b/common/moduleutils/Android.bp
@@ -18,4 +18,17 @@
 filegroup {
     name: "net-module-utils-srcs",
     srcs: ["src/**/*.java"],
-}
\ No newline at end of file
+}
+
+// Shared utility sources to be used by tethering modules
+filegroup {
+    name: "tethering-module-utils-srcs",
+    srcs: [
+        "src/android/net/ip/InterfaceController.java",
+        "src/android/net/netlink/*.java",
+        "src/android/net/shared/NetdUtils.java",
+        "src/android/net/shared/RouteUtils.java",
+        "src/android/net/util/InterfaceParams.java",
+        "src/android/net/util/SharedLog.java"
+    ],
+}