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:
ed08f4ba281f39ae3ae910263d6b6e9391a15b44faade869997f005d5b8b75be

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 +1,8 @@
 { 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.availableKernelModules = [
     # Definitely needed for USB:
     "usb_storage"
     "phy_qcom_qmp_combo"