MLBEDSW-11336: Properly add constant input tensors to debugdb
Constant inputs doesn't have a producer op, so we can't add that to the database, but we can add the tensor UID instead as a placeholder ID.
Signed-off-by: Johan Gunnarsson johan.gunnarsson@arm.com Change-Id: I26b026a2d0c759d84c2a97971cff870c3b78abbd