[mlir][linalg] Delete unused SameVariadicOperandSize trait from ops (#87124)

Both `Transpose` and `Broadcast` specify the `SameVariadicOperandSize`
trait. However neither has a variadic operand let alone more than one.

This is likely a relic from copying the boilerplate of the `Reduce`
definition.

Author: philass

mlir/include/mlir/Dialect/Linalg/IR/LinalgStructuredOps.td

@@ -391,7 +391,6 @@ def ReduceOp : LinalgStructuredBase_Op<"reduce", [
 
 def TransposeOp : LinalgStructuredBase_Op<"transpose", [
     DeclareOpInterfaceMethods<OpAsmOpInterface, ["getAsmResultNames"]>,
-    SameVariadicOperandSize,
     SingleBlockImplicitTerminator<"YieldOp">]> {
   let summary = "Transpose operator";
   let description = [{
@@ -470,7 +469,6 @@ def TransposeOp : LinalgStructuredBase_Op<"transpose", [
 
 def BroadcastOp : LinalgStructuredBase_Op<"broadcast", [
     DeclareOpInterfaceMethods<OpAsmOpInterface, ["getAsmResultNames"]>,
-    SameVariadicOperandSize,
     SingleBlockImplicitTerminator<"YieldOp">]> {
   let summary = "Static broadcast operator";
   let description = [{