reconcile Dim4D and NchwDim

[yipjustin]

Summary: TSIA.

Differential Revision: D56778340

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3428

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:hourglass_flowing_sand: No Failures, 9 Pending

As of commit 80d5101057ef6f5453f681b891a462576976b1f5 with merge base f0f4db877dd649c4e8ce951a4ccc3827841e9ad3 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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