[automerge] Adds a target for the libtextclassifier bert_tokenizer. 2p: 951bdd861d

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libtextclassifier/+/18414547

Bug: 228840235
Change-Id: Ie5f3cd0bc307d4106ccf9a3ff2706db84a775d2f