Fix megablox tile sizes

[gobbleturk]

Description

Tile sizes for megablox were being passed / being named inappropriately. E.g. before we were passing in wi_dlhs_embed as the fourth argument, but that will map to "k" of the dlhs which will actually be the model dimension.

Note this PR has the effect of mapping/permuting the tile sizes. You can see in existing tuned tile sizes like here the optimal wi_mlp_dim is actually related to the embed dim, not the mlp dim

Tests

• test irregular model shapes and tile sizes that batch command
• xprof (~66% MFU on gmms)

Checklist

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[NuojCheng]

lgtm