Remove GPU memory settings for monitor use

configuration.nix

@@ -9,13 +9,10 @@
   boot.kernelPackages = pkgs.linuxPackages_latest;
 
   # A bunch of boot parameters needed for optimal runtime on RPi 3B
-  boot.kernelParams = ["cma=256M"];
+  boot.kernelParams = ["cma=32M"];
   boot.loader.raspberryPi.enable = true;
   boot.loader.raspberryPi.version = 3;
   boot.loader.raspberryPi.uboot.enable = true;
-  boot.loader.raspberryPi.firmwareConfig = ''
-    gpu_mem=256
-  '';
   environment.systemPackages = with pkgs; [
     raspberrypi-tools
   ];
@@ -33,4 +30,5 @@
 
   # Configure basic SSH access
   services.openssh.enable = true;
+  services.openssh.permitRootLogin = true;
 }