Fix conv2d NHWC out_data_format

[khazaei]

Summary: Set out_data_format to 0 in xa_nn_conv2d_getsize for standard (non-grouped) conv2d to match the native NHWC output layout.

Differential Revision: D97172717

[pytorch-bot]

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@khazaei has exported this pull request. If you are a Meta employee, you can view the originating Diff in D97172717.

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