[Nech-C]

What does this PR do?

Fixes #29786 (issue)

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Who can review?

@amyeroberts

[asartran]

As discussed here, waiting for wider discussion about weight allocation from accelerate, as segformer will never be correctly split across devices due to highly imbalance sizes of different model modules

[ArthurZucker]

Thanks a lot for the PR! This was superseded by #41693, which landed on main and covers the same change, so closing this one.