[LlavaNext] Fix llava next unsafe imports

[ArthurZucker]

What does this PR do?

Fixes the imports of LlavaNext and the auto-mapping. this was pushed to the release

[HuggingFaceDocBuilderDev]

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[amyeroberts]

Thanks for fixing this!

In general, functions like select_best_resolution shouldn't go in image_processing_utils.py as it's model specific. The reason is to try and avoid the situation we had with some of the feature extractors functionality:

• Sometimes the same/similar function was implemented more than once, creating ambiguity over which one was "right"
• Or a single function tries to cover too many use cases making it buggy
  I'll think about how we can safely do this in the future.

However, is it's a fairly "general" utility here, so happy with this update :)