nixos-rpi5

Patched up some packages and some stuff to create a working version of nixos on raspberry pi 5.

Based on work from:

• https://github.com/NixOS/nixpkgs/issues/260754
• https://github.com/leo60228/nixpkgs/tree/rpi5
• https://github.com/nix-community/raspberry-pi-nix
• https://github.com/NixOS/nixos-hardware
• https://github.com/nvmd/nixos-raspberrypi
• https://wiki.nixos.org/wiki/NixOS_on_ARM/Raspberry_Pi_5#Build_NixOS_to_run_on_Raspberry_Pi_5
• https://discourse.nixos.org/t/what-happened-to-raspberry-pi-nix/62417/7