Add ubrk_clone to libicuuc stubs am: cb4bdb5a0e am: 8513092f8c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/libs/native_bridge_support/+/13536911

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Iba2cc7046f71111cb8199e56aa81a598d55b4593