Make `MobileBert` tokenizers independent from `Bert` (#19531)
* Make `MobileBert` tokenizers independent from `Bert`
* Update src/transformers/models/mobilebert/tokenization_mobilebert.py
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
* Fixed the name in the error message
* Update src/transformers/models/mobilebert/tokenization_mobilebert.py
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
* Removed extra space from the "copied" comment
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>