Omni: Fix omni_xpu_kernel layer_norm (Input must be contiguous) error

[caijimin]

In ComfyUI-Florence2 and some other workflow like InfiniteTalk, encounter below error

  File "/llm/ComfyUI/comfy/ops.py", line 531, in forward_comfy_cast_weights
    x = _omni_norm.layer_norm(x_2d, weight, bias, self.eps).reshape(orig_shape)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/omni_xpu_kernel/norm/__init__.py", line 80, in layer_norm
    return _get_native().layer_norm(input, weight, bias, eps)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: Input must be contiguous

Need change to

_get_native().layer_norm(input.contiguous(), weight, bias, eps