MLBEDSW-10333: Fixes for RewriteReduceSum
- Maintain rounding when lowering ReduceSum.
- Fix shape of intermediate tensor when ReduceSum is lowered to ReduceSum + Sub (shape should be inherited from the tensor connection)
- Keep quantization on the ReduceSum when ReduceSum is lowered to Transpose + ReduceSum.
Change-Id: I9653f3638bbda8fa287a3f8a32c4bd3abe4e79ae Signed-off-by: Alexander Bengtsson Alexander.Bengtsson@arm.com