[automerger skipped] Add ubrk_clone to libicuuc stubs am: 47edb0fd06 am: 720b41709f -s ours am: 9d51c9d4b7 -s ours am: 06ebc9e0d6 -s ours

am skip reason: Change-Id I4b1af65438fc83199e15e9dc157cf2425acd7364 with SHA-1 cb4bdb5a0e is in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/native_bridge_support/+/1581709

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ie0b0522ab6aa01a527296278e715ac6bc9e32307