linux_5_4: also include fpu patch

Otherwise zfs performance is unbearable

pkgs/top-level/all-packages.nix

@@ -16327,6 +16327,7 @@ in
     kernelPatches = [
       kernelPatches.bridge_stp_helper
       kernelPatches.request_key_helper
+      kernelPatches.export_kernel_fpu_functions."5.3"
     ];
   };