Rolling back PR #12076: [XLA:CPU][oneDNN] AVX512 vectorization
Rolling back PR #12076: [XLA:CPU][oneDNN] AVX512 vectorization
Reason: Broke JAX Arm CI
```
E     AssertionError: [b"'-prefer-256-bit' is not a recognized feature for this target (ignoring feature)"
```

Reverts 58d6f04ae41c442626f705eb03385c3de50266c0
