MLBEDSW-10106: Ethos-U55 MatMul implementation
Implementation of TOSA MatMul for Ethos-U55.
- Added scratch tensor return to operator queries.
- Allowed for differing input/output tensor formats.
- Cleanup of tensor format assignment.
Signed-off-by: Philip Hall philip.hall@arm.com Change-Id: I14cfa158bd0843ce6ff1516dfdb880f7100cc94a