z-image support npu

[luren55]

What does this PR do?

Notice: Here is a PR extraction from #12979 to support z-image runs on NPU.

Issue: The Diffusers Z-Image pipeline fails on Ascend NPU because aclnnIndex lacks support for complex64. When freqs_cis is stored as a complex tensor on the NPU and then indexed, the call crashes.

Fix: Rework the RoPE frequency handling so that the NPU never needs to index complex64 tensors.

Running Environment:
I run this model base on cache-dit(https://github.com/vipshop/cache-dit/) which depends on diffusers to inference.

Command:
python3 generate.py zimage --model-path /home/weights/Z-Image-Turbo --attn _native_npu

Error before fixed:

Result after fixed:

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[luren55]

@yiyixuxu Hello, here is an extracion from the previous PR(#12979), can you review this PR? Thank you.

[yiyixuxu]

thanks!

[yiyixuxu]

@bot style

[HuggingFaceDocBuilderDev]

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[yiyixuxu]

@bot /style

[github-actions]

Style fix runs successfully without any file modified.

[yiyixuxu]

can you run make fix-copies?

[luren55]

done

[st7109]

hello, we share same issue for complex64, i think this is necessary to add use_real parameter to Z-Image. please check my MR, #13824