Improve performance of NPU FA

[leisuzz]

What does this PR do?

NPU FA is more suitable for the shape of BNSD. After converted the shape of q, k, and v, the performance will improve a lot.

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[leisuzz]

Cc: @sayakpaul @a-r-r-o-w , Please take a look at this PR, thanks for your help :)

[a-r-r-o-w]

thanks!

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.