device tree configuration without overlays


I am using Yocto-Project BSP for the beaglebone black and run my custom linux image on it.
To enable both CAN bus controllers on it I need to configure therefore the device tree.
I’ve got this running with device tree overlays but actually don’t want to use the cape manager but
have it in the orign dtb file which is loaded at boottime.

Is it possible to implement device tree overlays directly into the orign .dtb/.dts file? How to do this?