[ET-VK] Adding round op support. (#9871)

This PR was created by the merge bot to help merge the original PR into
the main branch.
ghstack PR number: https://github.com/pytorch/executorch/pull/9792 by
@trivedivivek
^ 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/trivedivivek/72/base
ghstack PR head:
https://github.com/pytorch/executorch/tree/gh/trivedivivek/72/head
Merge bot PR base:
https://github.com/pytorch/executorch/tree/gh/trivedivivek/71/orig
Merge bot PR head:
https://github.com/pytorch/executorch/tree/gh/trivedivivek/72/orig
@diff-train-skip-merge

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Co-authored-by: Vivek Trivedi <5340687+trivedivivek@users.noreply.github.com>