sombrero: Add boot module

hosts/sombrero/configuration.nix

@@ -14,30 +14,6 @@
 
   environment.variables.EDITOR = "vim";
 
-  boot = {
-    loader = {
-      grub.enable = false;
-      efi.canTouchEfiVariables = true;
-
-      raspberryPi = {
-        enable = true;
-        version = 4;
-      };
-    };
-
-    tmp = {
-     useTmpfs = true;
-    };
-
-    kernelPackages = pkgs.linuxPackages_rpi4;
-    kernelParams = [
-      "8250.nr_uarts=1"
-      "console=ttyAMA0,115200"
-      "console=tty1"
-      "cma=128M"
-    ];
-  };
-
   hardware.enableRedistributableFirmware = true;
 
   # Set your time zone.

hosts/sombrero/modules/boot/default.nix

@@ -0,0 +1,25 @@
+{ pkgs, ... }: {
+  boot = {
+    loader = {
+      grub.enable = false;
+      efi.canTouchEfiVariables = true;
+
+      raspberryPi = {
+        enable = true;
+        version = 4;
+      };
+    };
+
+    tmp = {
+      useTmpfs = true;
+    };
+
+    kernelPackages = pkgs.linuxPackages_rpi4;
+    kernelParams = [
+      "8250.nr_uarts=1"
+      "console=ttyAMA0,115200"
+      "console=tty1"
+      "cma=128M"
+    ];
+  };
+}