GPLv2-only devicetrees make reuse difficult for software components
licensed under a different license.

The consensus is that a GPL/X11 dual-license should allow all necessary
uses, so relicense the vf*colibri* files to this combination.

CCs were acquired using:
git shortlog -sne --no-merges arch/arm/boot/dts/vf*colibri*
Acked-by: Cory Tusar <cory.tusar@pid1solutions.com>
Acked-by: Sanchayan Maity <maitysanchayan@gmail.com>
Acked-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>