[Feat] Support npu in Qwen2Model._update_causal_mask
Author: duanjunwen
Pull request: yes

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Dear @ArthurZucker and other transformers maintainers,
I am submitting this PR to adapt npu for AttentionMaskConverter._unmask_unattended in Qwen2Model. 
Best wishes,
Junwen

> can we remove unrelated changes please!

Looks like I shouldn't merge the latest main. I'll withdraw this and resubmit a PR.

> can we remove unrelated changes please!
I link the new PR here.
https://github.com/huggingface/transformers/pull/37369