Add Shipped field to libunwindstack README.chromium

Bug: 365320791
Change-Id: I02566f39f3378f7e521f9b6e74190549f46614e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/third_party/libunwindstack/+/6143093
Reviewed-by: Rodney Ding <rodneyding@google.com>
diff --git a/README.chromium b/README.chromium
index 66fa06e..fccf24b 100644
--- a/README.chromium
+++ b/README.chromium
@@ -5,6 +5,7 @@
 Version: N/A
 License: Apache 2.0 and BSD
 License File: LICENSE
+Shipped: yes
 Security Critical: yes
 
 Description: Canonical library to unwind Android call stacks.