[lucia] rm deprecated boot.loader.raspberryPi

needs to be fixed still according to https://github.com/NixOS/nixpkgs/pull/241534

machines/lucia/configuration.nix

@@ -20,14 +20,6 @@ in
 
   # Use the extlinux boot loader. (NixOS wants to enable GRUB by default)
   boot.loader.grub.enable = false;
-  boot.loader.raspberryPi.enable = false;
-  boot.loader.raspberryPi.version = 3;
-  boot.loader.raspberryPi.uboot.enable = true;
-  boot.loader.raspberryPi.firmwareConfig = ''
-    dtparam=audio=on
-    hdmi_ignore_edid_audio=1
-    audio_pwm_mode=2
-  '';
 
   # Enables the generation of /boot/extlinux/extlinux.conf
   boot.loader.generic-extlinux-compatible.enable = true;