Fix MPS availability check

[akihironitta]

What does this PR do?

Fixes #13946.

Does your PR introduce any breaking changes? If yes, please list them.

None

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cc @Borda @tchaton @rohitgr7 @akihironitta @justusschock

[kaushikb11]

@akihironitta Could you confirm it with author of the issue before merging it? Thanks!

[akihironitta]

@akihironitta Could you confirm it with author of the issue before merging it? Thanks!

I've confirmed it works locally on my machine but will do so to double-check the behaviour :)

---

Hi @adamgayoso, thank you for reporting the issue! Could you also check if it works as expected with the patch?

- _MPS_AVAILABLE = _TORCH_GREATER_EQUAL_1_12 and torch.backends.mps.is_available() and platform.platform() == "arm"
+ _MPS_AVAILABLE = _TORCH_GREATER_EQUAL_1_12 and torch.backends.mps.is_available() and platform.processor() == "arm"

[adamgayoso]

This will work!