Is there any way to get the noisy version? Or is that all forced by the hardware.
Even cameras that don't make any intentional decisions end up making decisions because of the physics of the sensor as an electrical device and how you read each sensor element.
You can modify the camera drivers etc on some devices to get nearly no processing output (other than the debayering color filtering etc by the ISP). I custom modded an LG V20 that I use for my mobile photography. I've either totally disabled or adjusted nearly every function of the signal processor as well as modified the camera program itself. I also use a custom modified gcam on it.
Some samples: https://imgur.com/gallery/W42TVGf
Look at my user (helforama) on imgur and pretty much every uploaded photo I took and edited on my V20... I need to update that account with newer photos :) been using the phone aince 2016 for photos!