default or selected kernelversion does not have config value CONFIG_PROC_DEVICETREE.
Result is shown for kernelversion 6.5.1
Support for device tree in /proc
configname: CONFIG_PROC_DEVICETREE
Linux Kernel Configuration
└─>Device Drivers
└─>Device Tree and Open Firmware support
└─>Support for device tree in /proc
In linux kernel since version 2.6.15 (release Date: 2006-01-02)
This option adds a device-tree directory under /proc which contains
an image of the device tree that the kernel copies from Open
Firmware or other boot firmware. If unsure, say Y here.
an image of the device tree that the kernel copies from Open
Firmware or other boot firmware. If unsure, say Y here.