[Intel GPU] Add TORCH_API macro to export symbol NestedTensor_to_mask for libtorch_xpu

[min-jean-cho]

Part of intel/torch-xpu-ops#1141.

The TORCH_API macro is added to export the symbol NestedTensor_to_mask, which is needed by libtroch_xpu for NestedTensor_softmax_dropout_xpu.

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