thinkpad: introduce t430

Copied everything from t440p, added a fix for the brightness keys

lenovo/thinkpad/t430/default.nix

@@ -0,0 +1,15 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [
+    ../.
+    ../../../common/cpu/intel
+  ];
+
+  boot = {
+    kernelParams = [
+      # fixes brightness keys, see https://wiki.archlinux.org/index.php/Lenovo_ThinkPad_T430s
+      "acpi_osi\='!Windows 2012'"
+    ];
+  };
+}