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/latitude/7430/default.nix

@@ -4,16 +4,16 @@
   imports = [
     ../../../common/cpu/intel
     ../../../common/pc/laptop
-    ../../../common/pc/laptop/ssd
+    ../../../common/pc/ssd
   ];
 
-  boot.kernelParams = [ 
+  boot.kernelParams = [
     # needed for Intel Iris Xe
     "i915.force_probe=46a8"
     "i915.enable_guc=3"
     "i915.fastboot=1"
     # needed for keyboard
-    "i8042.dumbkbd=1" 
-    "i8042.nopnp=1" 
+    "i8042.dumbkbd=1"
+    "i8042.nopnp=1"
   ];
 }