initramfs-tools: change license to GPL

The public domain "license" is very liberal and thus allows
this to be relicensed under mostly any compatible license.

Although not strictly needed many passed contributors agreed on
the license change. Many especially asked for the "or any later version",
thus it is now licensed under GPL v2 or later.

This should ease collaboration with dracut.

Acked-by: Jeff Bailey <jbailey@raspberryginger.com>
Acked-by: Kees Cook <kees@outflux.net>
Acked-by: Matt Kraai <kraai@ftbfs.org>
Acked-by: Michal Pokrywka <mpokrywka@hoga.pl>
Acked-by: martin f krafft <madduck@madduck.net>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Acked-by: Andres Salomon <dilinger@queued.net>
Acked-by: Loïc Minier <lool@dooz.org>
Acked-by: Chris Lamb <chris@chris-lamb.co.uk>
Acked-by: Michael Prokop <mika@grml.org>
Acked-by: Ferenc Wagner <wferi@niif.hu>
Acked-by: Avi Rozen <avi.rozen@gmail.com>
Acked-by: Piotr Lewandowski <piotr.lewandowski@gmail.com>
Acked-by: Daniel Reichelt <debian@itamservices.de>
Acked-by: Colin Watson <cjwatson@ubuntu.com>
Acked-by: Fabio M. Di Nitto <fabbione@fabbione.net>
Acked-by: Axel Beckert <abe@deuxchevaux.org>
Acked-by: debian@x.ray.net
Acked-by: Maik Zumstrull <maik@zumstrull.net>
Acked-by: David Härdeman <david@hardeman.nu>
Acked-by: Martin Michlmayr <tbm@cyrius.com>
Acked-by: Ben Collins <bcollins@ubuntu.com>
Acked-by: Glennie Vignarajah <glennie@glennie.fr>
Acked-by: Ben Hutchings <ben@decadent.org.uk>
Acked-by: Aaron M. Ucko <amu@alum.mit.edu>
Acked-by: kel@otaku42.de
Acked-by: Maximilian Gass <mxey@ghosthacking.net>
Acked-by: Joey Hess <joey@kitenet.net>
Acked-by: Gerfried Fuchs <rhonda@deb.at>
Acked-by: Tormod Volden <debian.tormod@gmail.com>

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