torch.aten.mm to linalg

[AmosLewis]

resnet50_vaiq_int8.default.torch-onnx.mlir:1315:13: error: failed to legalize operation 'torch.aten.mm' that was explicitly marked illegal
    %1311 = torch.operator "onnx.Gemm"(%1298, %1304, %1310) {torch.onnx.alpha = 1.000000e+00 : f32, torch.onnx.beta = 1.000000e+00 : f32, torch.onnx.transB = 1 : si64} : (!torch.vtensor<[1,2048],f32>, !torch.vtensor<[1000,2048],f32>, !torch.vtensor<[1000],f32>) -> !torch.vtensor<[1,1000],f32> 
            ^
resnet50_vaiq_int8.default.torch-onnx.mlir:1315:13: note: see current operation: %11518 = "torch.aten.mm"(%11478, %11517) : (!torch.vtensor<[1,2048],f32>, !torch.vtensor<[2048,1000],!torch.qint8>) -> !torch.vtensor<[1,1000],f32>