Fix MPS compatibility in get_1d_sincos_pos_embed_from_grid #12432

[Aishwarya0811]

What does this PR do?

Fix MPS compatibility in get_1d_sincos_pos_embed_from_grid
Add dtype parameter with auto-detection for MPS devices. MPS doesn't support
float64, so the function now automatically uses float32 on MPS while maintaining
float64 on CUDA/CPU for backward compatibility. Users can also explicitly
override the dtype if needed.

Fixes #12432

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Who can review?

@bghira
@DN6

[DN6]

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[Aishwarya0811]

@DN6 @bghira I’d really appreciate it if you could review the PR. If it resolves the issue as expected, please consider approving the contribution

[bghira]

it looks good, it mirrors how i was going to approach it. i have health issues this week and might take time to return a response, but i am following along. thank you for your contribution.