[mlir][tosa] Remove extra declarations of MulOperandsAndResultElementType in TosaOps.td (#134300)

Minor code cleanup

Signed-off-by: Jerry Ge <[email protected]>

Author: Jerry-Ge

mlir/include/mlir/Dialect/Tosa/IR/TosaOps.td

@@ -974,11 +974,6 @@ def Tosa_MinimumOp : Tosa_ElementwiseOp<"minimum", [
   ];
 }
 
-def MulOperandsAndResultElementType :
-  NativeOpTrait<"MulOperandsAndResultElementType"> {
-  let cppNamespace = "mlir::OpTrait::tosa";
-}
-
 //===----------------------------------------------------------------------===//
 // Operator: mul
 //===----------------------------------------------------------------------===//