Merge pull request #107214 from Ericson2314/linux-config-cleanup

lib: Clean up how linux and gcc config is specified

nixos/modules/system/activation/top-level.nix

@@ -190,7 +190,7 @@ in
 
     system.boot.loader.kernelFile = mkOption {
       internal = true;
-      default = pkgs.stdenv.hostPlatform.platform.kernelTarget;
+      default = pkgs.stdenv.hostPlatform.linux-kernel.target;
       type = types.str;
       description = ''
         Name of the kernel file to be passed to the bootloader.

nixos/modules/system/boot/loader/generations-dir/generations-dir.nix

@@ -59,7 +59,7 @@ in
 
     system.build.installBootLoader = generationsDirBuilder;
     system.boot.loader.id = "generationsDir";
-    system.boot.loader.kernelFile = platform.kernelTarget;
+    system.boot.loader.kernelFile = linux-kernel.target;
 
   };
 }

nixos/modules/system/boot/loader/raspberrypi/raspberrypi.nix

@@ -103,6 +103,6 @@ in
 
     system.build.installBootLoader = builder;
     system.boot.loader.id = "raspberrypi";
-    system.boot.loader.kernelFile = platform.kernelTarget;
+    system.boot.loader.kernelFile = linux-kernel.target;
   };
 }