Fix gemma2 with sdpa? 
Author: ArthurZucker
Pull request: yes

# What does this PR do?

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Fixes #32390

## Before submitting
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Models:

- text models: @ArthurZucker
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- flax: @sanchit-gandhi
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- tokenizers: @ArthurZucker
- trainer: @muellerzr and @SunMarc

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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_32403). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

Closing as #34282 superseeds