Fix `EfficientFormer`
# What does this PR do?

Fix `EfficientFormer`:

  - correct checkpoints
  - fix an device issue regarding `EfficientFormerSelfAttention.ab`, see [failed job run page](https://github.com/huggingface/transformers/actions/runs/3992425421/jobs/6848316487)

    The error:
    ```bash
    (line 136)  RuntimeError: Expected all tensors to be on the same device, but found at least two devices, cuda:0 and cpu!
    ```
_The documentation is not available anymore as the PR was closed or merged._