Get access to ExecuTorch (#2471)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/2471

Need to access ExecuTorch to export EMG-hw model for wrist devices' Vulkan GPU.

bypass-github-export-checks
bypass-github-pytorch-ci-checks

Reviewed By: JacobSzwejbka, jorgep31415, dbort

Differential Revision: D54963814

fbshipit-source-id: e741a5b0f0e4e0370bf712a3d0b6fd4f01f9c74f