modules/outputs: expose commandLineDtbNode option

We allow `bootargs` and `bootargs-override` for now only.

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>

modules/base.nix

@@ -58,6 +58,11 @@ in {
         default = [];
         description = "Kernel command line";
       };
+      commandLineDtbNode = mkOption {
+        type = types.enum [ "bootargs" "bootargs-override" ];
+        default = "bootargs";
+        description = "Kernel command line's devicetree node";
+      };
       imageFormat = mkOption {
         type = types.enum ["fit" "uimage"];
         default = "uimage";