util/liveiso: Update to NixOS 21.11

Update configs so that they work with NixOS 21.11. Drop `iasl` package
since it was replaced with `acpica-tools`.

Change-Id: Icb9a382b83b3b3e55126bb0bb508659d11497a05
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59881
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
diff --git a/util/liveiso/common.nix b/util/liveiso/common.nix
index 3961aba..2ed4af5 100644
--- a/util/liveiso/common.nix
+++ b/util/liveiso/common.nix
@@ -8,7 +8,7 @@
 		<nixpkgs/nixos/modules/installer/cd-dvd/iso-image.nix>
 	];
 
-	system.stateVersion = "21.05";
+	system.stateVersion = "21.11";
 
 	isoImage = {
 		makeEfiBootable = true;
@@ -127,7 +127,6 @@
 		hexdump
 		htop
 		i2c-tools
-		iasl
 		intel-gpu-tools
 		inxi
 		iotools