Can't locate hardware directory in kernel source

I’m trying to add a camera module to the device tree by following NVIDIA’s sensor driver programming guide.

My understanding is that I need to make this additions and modifications to the kernel source located on the host PC then follow the steps in the “Kernel Configuration” and “Device Registration” sections to fully integrate my camera on the TX2.

I downloaded the kernel source from Jetson Download Center under L4T sources but could not locate the directories described in the guide under the “Camera Modules and Device Tree” section (hardware/nvidia/platform/t19x/common/kernel-dts/). Please help me figure out where my understanding is wrong.