Remove usage of boot.initrd.availableKernelModules = lib.mkForce [

This should make it easier for users of the module to add their own
additional initrd modules, e.g. for disk encryption.

The ISO should be reproducible and have the following SHA256 hash:
c0f2c848af53e80d5f987fe23c62852447e7d360114c5649d9e9e51988b18a1e

iso.nix

@@ -5,6 +5,8 @@
   boot.supportedFilesystems.zfs = lib.mkForce false;
   boot.supportedFilesystems.cifs = lib.mkForce false;
 
+  hardware.enableAllHardware = lib.mkForce false;
+
   # For some reason the adsp booting up messes with USB boot, so disable it.
   boot.blacklistedKernelModules = [ "qcom_q6v5_pas" ];
 

modules/x1e80100.nix

@@ -1,13 +1,9 @@
 { pkgs, lib, ... }:
 
 {
-  boot.initrd.availableKernelModules = lib.mkForce [
-    # Needed by the NixOS iso for booting in general
-    "squashfs"
-    "iso9660"
-    "uas"
-    "overlay"
-
+  boot.initrd.includeDefaultModules = false;
+  boot.initrd.systemd.tpm2.enable = false; # This also pulls in some modules our kernel is not build with.
+  boot.initrd.availableKernelModules = [
     # Definitely needed for USB:
     "usb_storage"
     "phy_qcom_qmp_combo"