MLBEDSW-10425: Don't IFM-fuse non-unit Rescales on ReduceSum
- ReduceSum only supports unit scaling on the IFM, update architectureConstraints to account for this.
Change-Id: If072b0f3c6d92b631c1d0cae71336e5293f7ab08 Signed-off-by: Alexander Bengtsson Alexander.Bengtsson@arm.com