[ET-VK][ez] Don't copy zeros for cache tensors #15601
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Currently, cache tensors for SDPA are prepacked even though the mutable buffer data just contains zeros. For fused SDPA, this step can be skipped. Differential Revision: [D86226137](https://our.internmc.facebook.com/intern/diff/D86226137/) ghstack-source-id: 320850472 Pull Request resolved: #15580
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Currently, cache tensors for SDPA are prepacked even though the mutable buffer data just contains zeros. For fused SDPA, this step can be skipped. Differential Revision: [D86226137](https://our.internmc.facebook.com/intern/diff/D86226137/)
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #15580 by @SS-JIA
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/SS-JIA/351/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/351/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/SS-JIA/350/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/351/orig
Differential Revision: D86226137
@diff-train-skip-merge