thinkpad: common.nix -> default.nix + fixup after intel.nix drop

lenovo/thinkpad/t410/default.nix

@@ -1,6 +1,8 @@
 { config, pkgs, ... }:
 
 {
+  imports = [ ../. ];
+
   boot = {
     kernelParams = [
       "drm.debug=0"

lenovo/thinkpad/t440p/default.nix

@@ -1,6 +1,8 @@
 { config, pkgs, ... }:
 
 {
+  imports = [ ../. ];
+
   boot = {
     extraModprobeConfig = ''
       options bbswitch use_acpi_to_detect_card_state=1

lenovo/thinkpad/t460s/default.nix

@@ -2,6 +2,7 @@
 
 {
   imports = [
+    ../.
     ../lib/kernel-version.nix
   ];
 

lenovo/thinkpad/x140e/default.nix

@@ -1,7 +1,7 @@
 { config, lib, pkgs, ... }:
 
 {
-  imports = [ ../common.nix ];
+  imports = [ ../. ];
 
   boot = {
     # wireless

lenovo/thinkpad/x220/default.nix

@@ -1,7 +1,7 @@
 { config, pkgs, ... }:
 
 {
-  imports = [ ../intel.nix ];
+  imports = [ ../. ];
 
   # hard disk protection if the laptop falls
   services.hdapsd.enable = true;
@@ -11,4 +11,6 @@
   #security.pam.services.login.fprintAuth = true;
   #security.pam.services.xscreensaver.fprintAuth = true;
   # similarly for other PAM providers
+
+  services.xserver.videoDrivers = [ "intel" ];
 }