Mark NetworkStack as updatable.

This is an updatable module. The flag enforces conformance to associated requirements with a module being updatable e.g. compiling against stable SDKs.

Bug: 153333044
Test: m
Change-Id: If34230b65fea3d73da28db2d6ee8a499b108f3ae
diff --git a/Android.bp b/Android.bp
index 6dd4ca2..d64327d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -202,6 +202,7 @@
     manifest: "AndroidManifest.xml",
     // The permission configuration *must* be included to ensure security of the device
     required: ["NetworkPermissionConfig"],
+    updatable: true,
 }
 
 // Android library to derive test APKs for integration tests