util/liveiso: Install UEFITool packages

Install both versions of UEFITool, the one with the old engine and the
new one.

It's not possible to use both packages in the same environment, since
there is a collision between the names of the binary files. To make sure
a specific package is used, a new environment needs to be spawned with
the following command:

  $ nix-shell -p <package_name>

The UEFITool binaries can be executed from the shell then.

Change-Id: Ia5d679c6e7cd01c2ab819bd6c085596a926c494d
Signed-off-by: Felix Singer <felix.singer@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57624
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

util/liveiso/common.nix

@@ -152,6 +152,8 @@
 		testdisk
 		tmate
 		tmux
+		uefitool
+		uefitoolPackages.old-engine
 		unzip
 		upterm
 		usbutils