Use embedded native libs for NetworkStack.apk.

So that the /system version of NetworkStack.apk can be re-installed on
/data without causing problems. This is useful for testing and necessary
for supporting rollback to the system version of NetworkStack.apk.

Bug: 131703417
Bug: 132195177
Test: Confirm NetworkStack.apk now includes .so files.
Test: adb install --staged NetworkStack.apk
      adb reboot
      Device reboots without problems.

Change-Id: I7c9a1702a2c18e0333b5e409f04b7658fe685f97
diff --git a/packages/NetworkStack/Android.bp b/packages/NetworkStack/Android.bp
index 62de2ba..9c8efe6 100644
--- a/packages/NetworkStack/Android.bp
+++ b/packages/NetworkStack/Android.bp
@@ -116,6 +116,7 @@
     defaults: ["NetworkStackAppCommon"],
     certificate: "networkstack",
     manifest: "AndroidManifest.xml",
+    use_embedded_native_libs: true,
 }
 
 genrule {