Revert "Arm backend: Match fp32->int32 cast between pytorch and TOSA'…

[psiddh]

…s CAST (#12243)"

This reverts commit 1315388.

Summary

[PLEASE REMOVE] See CONTRIBUTING.md's Pull Requests for ExecuTorch PR guidelines.

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Test plan

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[pytorch-bot]

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❌ 2 Cancelled Jobs, 6 Unrelated Failures

As of commit 02b8f58 with merge base defa089 ():

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-models-linux (add_mul, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
• pull / test-models-linux-basic (vit, xnnpack-quantization-delegation, buck2, linux.2xlarge, executorch-u... / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
• pull / test-models-linux-basic (vit, xnnpack-quantization-delegation, cmake, linux.2xlarge, executorch-u... / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
• pull / test-selective-build-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-eval_llama-mmlu-linux / linux-job (gh) (trunk failure)
  RuntimeError: Dataset scripts are no longer supported, but found mmlu_no_train.py

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[lucylq]

Thanks - could you tag the author as well?

Reverting as this is causing some internal failures and the codebase is going out of sync --> we can re-apply this, import to internal and then fix the issues before merging.

[psiddh]

Reverting this change, as they are breaking the internal CI. Will add/merge this back once the forward fix is in place

@YufengShi-dudu @oscarandersson8218 @digantdesai @lucylq

[psiddh]

(Not merging) Closing this PR @digantdesai pushed a forward fix : #12312