Revert D62466496: Multisect successfully blamed "D62466496: [ExecuTorch] Build optimized kernels with bf16 support and gate usage at runtime" for one build failure

Summary:
This diff reverts D62466496
D62466496: [ExecuTorch] Build optimized kernels with bf16 support and gate usage at runtime by swolchok causes the following build failure:

Tests affected:
- [playground_mwa_all_for_perftest](https://www.internalfb.com/intern/test/844425060509872/)

Here's the Multisect link:
https://www.internalfb.com/multisect/10105407
Here are the tasks that are relevant to this breakage:
T191385168: 100+ CI signals unhealthy for mwa_import_android

The backout may land if someone accepts it.

If this diff has been generated in error, you can Commandeer and Abandon it.

Reviewed By: sheepsword

Differential Revision: D62678457

fbshipit-source-id: 8a06dc283aa0ecabb1c75114166fa7b7184df989