fix 6.18 kernel build

Format all Nix files using the officially approved formatter,
making the CI check introduced in the previous commit succeed:

  nix-build ci -A fmt.check

This is the next step of the of the [implementation](https://github.com/NixOS/nixfmt/issues/153)
of the accepted [RFC 166](https://github.com/NixOS/rfcs/pull/166).

This commit will lead to merge conflicts for a number of PRs,
up to an estimated ~1100 (~33%) among the PRs with activity in the past 2
months, but that should be lower than what it would be without the previous
[partial treewide format](https://github.com/NixOS/nixpkgs/pull/322537).

Merge conflicts caused by this commit can now automatically be resolved while rebasing using the
[auto-rebase script](https://github.com/NixOS/nixpkgs/tree/8616af08d915377bd930395f3b700a0e93d08728/maintainers/scripts/auto-rebase).

If you run into any problems regarding any of this, please reach out to the
[formatting team](https://nixos.org/community/teams/formatting/) by
pinging @NixOS/nix-formatting.

Closes #376820

The issue with providing `moduleMakeFlags` via `passthru` of the kernel
package is that when this package gets overriden[1], the `moduleMakeFlags`
list still references the kernel without the overrides.

This broke e.g. kernel modules of linux-rpi4 which can be reproduced
with

    nix-build --argstr system aarch64-linux -A linuxKernel.packages.linux_rpi4.zfs_2_3

This used to break with

    Error: modDirVersion 6.6.51 specified in the Nix expression is wrong, it should be: 6.6.51-v8

since KBUILD_OUTPUT referenced the kernel without the changes from
`overrideDerivation` that also changes the `modDirVersion`.

The new approach is to add the build flags right into
`linuxKernel.packages.linux_X_Y`: that way we don't need any hacks to
update `moduleMakeFlags` when the derivation with the passthru gets
overridden.

By using the fixpoint of the package-set, the `kernelModuleMakeFlags`
list is correctly updated. E.g. given

    with import ./. {};

    linuxKernel.packages.linux_6_6.extend (self: super: {
      kernel = super.kernel.overrideAttrs (_: {
        name = "linux-snens";
      });
    })

the `makeFlags` is correctly updated:

    $ nix-instantiate snenskek.nix -A zfs_2_3.makeFlags --eval --strict
    [ "ARCH=x86_64" "CROSS_COMPILE=" "KBUILD_OUTPUT=/nix/store/gsp68549k1aqbwxwczpgw67w5jjn4shw-linux-snens-dev/lib/modules/6.6.74/build" ]

[1] E.g. `linux-rpi4`.