MLBEDSW-10708: Fix setting Rescale IFM/OFM tensor dtype to unsigned
Made sure the dtype of a tensor is changed to unsigned in GraphIR optimizer when the rescale operator has the attribute input_unsigned/output_unsigned set to true.
Change-Id: I568638ef0e93252b55a2e748c2ed64d35a208977 Signed-off-by: Max Bergfelt max.bergfelt@arm.com