hosts/pi: remove kernel override

hosts/pi/hardware-configuration.nix

@@ -1,6 +1,5 @@
 {
   lib,
-  pkgs,
   modulesPath,
   ...
 }:
@@ -11,44 +10,6 @@
   ];
 
   boot = {
-    kernelPackages =
-      let
-        version = "6.1.73";
-        tag = "stable_20240124";
-        srcHash = "sha256-P4ExzxWqZj+9FZr9U2tmh7rfs/3+iHEv0m74PCoXVuM=";
-      in
-      pkgs.linuxPackagesFor (
-        pkgs.linux_rpi4.override {
-          argsOverride = {
-            src = pkgs.fetchFromGitHub {
-              owner = "raspberrypi";
-              repo = "linux";
-              rev = tag;
-              hash = srcHash;
-            };
-            version = version;
-            modDirVersion = version;
-            structuredExtraConfig = { };
-            kernelPatches = [
-              {
-                name = "drm-rp1-depends-on-instead-of-select-MFD_RP1.patch";
-                patch = pkgs.fetchpatch {
-                  url = "https://github.com/peat-psuwit/rpi-linux/commit/6de0bb51929cd3ad4fa27b2a421a2af12e6468f5.patch";
-                  hash = "sha256-9pHcbgWTiztu48SBaLPVroUnxnXMKeCGt5vEo9V8WGw=";
-                };
-              }
-              {
-                name = "iommu-bcm2712-don-t-allow-building-as-module.patch";
-                patch = pkgs.fetchpatch {
-                  url = "https://github.com/peat-psuwit/rpi-linux/commit/693a5e69bddbcbe1d1b796ebc7581c3597685b1b.patch";
-                  hash = "sha256-8BYYQDM5By8cTk48ASYKJhGVQnZBIK4PXtV70UtfS+A=";
-                };
-              }
-            ];
-          };
-        }
-      );
-
     # Stop ZFS kernel being built
     supportedFilesystems = lib.mkForce [
       "btrfs"
@@ -69,23 +30,6 @@
     (final: prev: {
       makeModulesClosure = x: prev.makeModulesClosure (x // { allowMissing = true; });
     })
-    (final: prev: {
-      raspberrypifw =
-        let
-          version = "1.20240529";
-          srcHash = "sha256-KsCo7ZG6vKstxRyFljZtbQvnDSqiAPdUza32xTY/tlA=";
-        in
-        pkgs.raspberrypifw.override {
-          argsOverride = {
-            src = prev.fetchFromGitHub {
-              owner = "raspberrypi";
-              repo = "firmware";
-              rev = "${version}";
-              hash = srcHash;
-            };
-          };
-        };
-    })
   ];
 
   fileSystems = {