[mlir][Linalg] Remove unused header include.

Summary: There seems to be no direct usage of any tosa utils.

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Differential Revision: https://phabricator.intern.facebook.com/D60250896

mlir/lib/Dialect/Linalg/Transforms/WinogradConv2D.cpp

@@ -17,7 +17,6 @@
 #include "mlir/Dialect/Linalg/IR/Linalg.h"
 #include "mlir/Dialect/Linalg/Utils/Utils.h"
 #include "mlir/Dialect/Tensor/IR/Tensor.h"
-#include "mlir/Dialect/Tosa/Utils/ConversionUtils.h"
 #include "mlir/Dialect/Utils/StaticValueUtils.h"
 #include "mlir/Transforms/GreedyPatternRewriteDriver.h"
 #include "llvm/Support/MathExtras.h"