[mlir][Linalg] Conv ops lowering to std calls added.

[limo1996]

Summary

Lowering of newly defined Conv ops in TC syntax to standard
dialect is not supported and therefore this commit adds support
for it.

[limo1996]

rebased

[limo1996]

rebased

mlir/lib/Conversion/LinalgToStandard/LinalgToStandard.cpp

patterns.insert<
       LinalgOpConversion<FillOp>,
       LinalgOpConversion<GenericOp>,
       LinalgOpConversion<IndexedGenericOp>>(ctx);
   // TODO: collect all auto-generated named ops with a tblgen directive.
   patterns.insert<
       LinalgOpConversion<DotOp>,
       LinalgOpConversion<BatchMatmulOp>,
       LinalgOpConversion<MatvecOp>,
-      LinalgOpConversion<MatmulOp>>(ctx);
+      LinalgOpConversion<MatmulOp>,
+      LinalgOpConversion<ConvWOp>,
+      LinalgOpConversion<ConvNWCOp>,
+      LinalgOpConversion<ConvNCWOp>,
+      LinalgOpConversion<ConvHWOp>,
+      LinalgOpConversion<ConvNHWCOp>,
+      LinalgOpConversion<ConvNCHWOp>,
+      LinalgOpConversion<ConvDHWOp>,
+      LinalgOpConversion<ConvNDHWCOp>,
+      LinalgOpConversion<ConvNCDHWOp>>(ctx);
   // clang-format on
 }
 
 namespace {
 struct ConvertLinalgToStandardPass
     : public ConvertLinalgToStandardBase<ConvertLinalgToStandardPass> {
   void runOnOperation() override;
 };