Qwen2VL fix cos,sin dtypes to float when used with deepspeed

[ArdalanM]

What does this PR do?

Minor fix for Qwen2VL models where the sin and cos position embeddings where wrongly casted when used with DeepSpeed. Related issue (#36187)

cc @ArthurZucker 🤗

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[zucchini-nlp]

Must have been fixed by #36065?

[ArthurZucker]

LGTM, but we can probably do this in apply_rotary_pos_emb_flashatt and apply_rotary_pos_emb_vision to cover both cases! (.float done in if and in else) !

[MrToy]

Must have been fixed by #36065?

Issue is reintroduced by #35837

[ArthurZucker]

Yep let's merge this (need to fix the modular fix not the modeling file! 🤗 )

[zucchini-nlp]

Hey, let's merge this and have in the next patch release (dunno when that will be). Seems to be bothering more people as we wait

@ArdalanM can you please add the same changes in modular_xxx.py files and then run make fix-copies to make CI happy?

[zucchini-nlp]

Thanks a lot! ❤️

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