[ez] Add `delegation_info` dep to buck target

## Context

https://github.com/pytorch/executorch/pull/7803 added an import to export_llama but did not add it to the buck target.

Differential Revision: [D68716129](https://our.internmc.facebook.com/intern/diff/D68716129/)

ghstack-source-id: 263234883
Pull Request resolved: https://github.com/pytorch/executorch/pull/7963

Co-authored-by: Stephen Jia <ssjia@meta.com>