[Feature] Add DTS support

[diferhe]

First of all, thank you for the great work! Wouldn't it be neat to add support for patching the kernel with custom or altered DTS files? Surprisingly, it is relatively easy to do with the image builder, as demonstrated here.

As I am relatively new to Nix, I am seeking suggestions on the correct approach to take. I will probably give it a try using the vanilla ImageBuilder without Nix, but if it works, I would like to integrate it into this project.

What do you think?

[astro]

If it is possible with the imagebuilder and whatever is available in nixpkgs, I encourage you to go ahead and try!

We can sort out any beginner mistakes in the PR review.