mayushii: Work around broken DP Alt Mode hotplug

This only downgrades the kernel, so that is not a long term option, but
at least makes it possible to not reboot twice a day or so.

machines/mayushii/hardware-configuration.nix

@@ -7,6 +7,9 @@
 
   boot = {
     kernelModules = [ "kvm-amd" ];
+    # Workaround for DP Alt Mode hotplug not working in kernel (https://git.sbruder.de/simon/nixos-config/issues/69).
+    # requires mkForce because of nixos-hardware setting it to linuxPackages_latst
+    kernelPackages = lib.mkForce pkgs.linuxPackages_6_0;
     loader = {
       grub.enable = false;
       systemd-boot.enable = true;