[onnx] Update DefaultDomainGtoP.cpp gridsampler (#3228)

Gridsampler
In onnx the interpolation mode is called 'linear' whereas in pytorch it
is called 'bilinear'. This led to the problem that everything other than
'bilinear' was rejected. It needed to be changed to linear.

lib/Conversion/TorchOnnxToTorch/DefaultDomainGtoP.cpp

@@ -124,11 +124,11 @@ void mlir::torch::onnx_c::populateDefaultDomainGtoP(
           return rewriter.notifyMatchFailure(binder.op,
                                              "gridShape[3] expected to be 2");
         std::string mode;
-        if (binder.customOpNameStringAttr(mode, "mode", "bilinear"))
+        if (binder.customOpNameStringAttr(mode, "mode", "linear"))
           return rewriter.notifyMatchFailure(binder.op, "mode bind failure");
-        if (mode != "bilinear")
+        if (mode != "linear" && mode != "bilinear")
           return rewriter.notifyMatchFailure(
-              binder.op, "currently only mode : bilinear supported");
+              binder.op, "currently only mode : linear supported");
         std::string padding;
         if (binder.customOpNameStringAttr(padding, "padding_mode", "zeros"))
           return rewriter.notifyMatchFailure(binder.op,