Replace symlink references by real path and delete symlink

The common/pc/laptop/ssd folder was apparently moved a level up and was
replaced by a symlink to keep things working. We can consolidate this now.

dell/xps/15-9500/default.nix

@@ -6,7 +6,7 @@ in
   imports = [
     ../../../common/cpu/intel
     ../../../common/pc/laptop
-    ../../../common/pc/laptop/ssd
+    ../../../common/pc/ssd
   ];
 
   # Boot loader
@@ -18,7 +18,7 @@ in
   # Thermald doesn't have a default config for the 9500 yet, the one in this repo
   # was generated with dptfxtract-static (https://github.com/intel/dptfxtract)
   services.thermald.configFile = lib.mkDefault thermald-conf;
-  
+
   # WiFi speed is slow and crashes by default (https://bugzilla.kernel.org/show_bug.cgi?id=213381)
   # disable_11ax - required until ax driver support is fixed
   # power_save - works well on this card