[Contrib][TRT] Fix Conv2D construction when channels attribute is not available.#6805
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This very small PR changes how channels are extracted from a Conv2D relay op when converting to TensorRT. Previously, we relied on the
channelsattribute being available. However, it is optional and often left asNone. When attempting to convert in this casestoifails with an unpleasant error. Since we are already enforcing that the weight layout isOIHW, there is no downside to instead extracting the channel info from the weight shape. I updated the corresponding conv2d test to not specify channels to confirm that this change resolves the issue.