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.

gpd/micropc/default.nix

@@ -2,7 +2,7 @@
 {
   imports = [
     ../../common/pc/laptop
-    ../../common/pc/laptop/ssd
+    ../../common/pc/ssd
   ];
 
   # Needed to have the keyboard working during the initrd sequence

gpd/p2-max/default.nix

@@ -1,7 +1,7 @@
 {
   imports = [
     ../../common/pc/laptop
-    ../../common/pc/laptop/ssd
+    ../../common/pc/ssd
     ../../common/cpu/intel/kaby-lake
     ../../common/hidpi.nix
   ];

gpd/pocket-3/default.nix

@@ -4,7 +4,7 @@ in
 {
 	imports = [
 		../../common/pc/laptop
-		../../common/pc/laptop/ssd
+		../../common/pc/ssd
     ../../common/hidpi.nix
     ../../common/gpu/24.05-compat.nix
 	];

gpd/pocket-4/default.nix

@@ -4,7 +4,7 @@ in
 {
   imports = [
     ../../common/pc/laptop
-    ../../common/pc/laptop/ssd
+    ../../common/pc/ssd
     ../../common/cpu/amd
     ../../common/cpu/amd/pstate.nix
     ../../common/gpu/amd