hosts/xps16: remove redundant ipu6 config

hosts/xps16/ipu6.nix

@@ -8,17 +8,6 @@ in
     platform = "ipu6epmtl";
   };
 
-  hardware.firmware = lib.optionals cfg.enable (with pkgs; [
-    ipu6-camera-bins
-    ivsc-firmware
-  ]);
-
-  services.udev.extraRules = lib.mkIf cfg.enable ''
-    SUBSYSTEM=="intel-ipu6-psys", MODE="0660", GROUP="video"
-  '';
-
-  boot.extraModulePackages = lib.optionals cfg.enable (with config.boot.kernelPackages; [ ipu6-drivers ]);
-
   environment.systemPackages = lib.optionals cfg.enable (with pkgs; [
     libcamera
   ]);
@@ -26,7 +15,10 @@ in
   # https://jgrulich.cz/2024/08/19/making-pipewire-default-option-for-firefox-camera-handling/
   services.pipewire.wireplumber.extraConfig."disable-v4l2" = lib.mkIf cfg.enable {
     "wireplumber.profiles" = {
-      "main" = {"monitor.v4l2" = "disabled";};
+      "main" = {
+        "monitor.v4l2" = "disabled";
+        "monitor.libcamera" = "optional";
+      };
     };
   };