message: Fix TFL_Mean op configuration
  TFL_Mean op was incorrectly configured to have
  the same input/output scales which is not true.
  Removing this config fixes conversion. Without it,
  conversion code would add an addition Quantize op
  for rescaling.
diff: @@ -1656,7 +1656,7 @@ def TFL_MaximumOp : TFL_Op<"maximum", [
  let hasOptions = 0;
  }
  -def TFL_MeanOp : TFL_Op<"mean", [NoSideEffect, SameOperandsAndResultsScale]> {
  +def TFL_MeanOp : TFL_Op<"mean", [NoSideEffect]> {
  let summary = "Mean operator";
  let description = [{
  