MLBEDSW-9859: MLCE: Update constraint class to reject float

 - Operators with float input or output is not supported and should be
set to OpType::Passthrough. This does not happen since the architecture
constraint class is missing the float constraint
 - Update constraint class to reject datatype float
 - Use passthrough options in writer since passthrough op's do not
have attribute data

Change-Id: I7f2a8e18155a1c4c41761f4e8ff01ee9c8761298
Signed-off-by: Johan Alfven <johan.alfven@arm.com>