(WIP) microsoft/surface: kernel 6.18

[8bitbuddhist]

Description of changes

Updates the stable linux-surface kernel to 6.18. There aren't any official 6.18 patches from linux-surface, so this uses the 6.17 patch set with some slight modifications to account for differences in the kernel source.

Will keep this as WIP until 6.18 hits NixOS' stable channel and other kernel modules get updated.

Things done

• Tested the changes in your own NixOS Configuration
• Tested the changes end-to-end by using your fork of nixos-hardware and
  importing it via <nixos-hardware> or Flake input

[8bitbuddhist]

It works! :D

No weird crashes, no weird behaviors, no problems shutting down or rebooting.

The only problem is patch 3: in the original patch, line 366 causes the kernel build to fail and I have no idea why. I worked around this by deleting this chunk and just using the value it would've been set to. If that wasn't the case, the 6.17 patches would work without any modification.

I also tried pulling in this camera patch for SP 9, but the patch fails in a bunch of places. I'll play with it when I have some more time.

[matthiasdotsh]

Just tested this on my machine with zfs-2.4.0-rc5 (zfs_unstable) and it works!

So nice, that we no longer depend on a release in the linux-surface repository!