ARM: dts: vf610-twr: relicense vf610-twr.dts under GPLv2/X11

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 vf610-twr.dts file to this combination.

CCs were acquired using (updated some email addresses, commented out
bouncing email addresses with --):
git shortlog -sne --no-merges arch/arm/boot/dts/vf610-twr.dts

--CC: Chao Fu <B44548@freescale.com>
CC: Cosmin Stoica <cosminstefan.stoica@freescale.com>
--CC: Fugang Duan <B38611@freescale.com>
--CC: Jingchang Lu <b35083@freescale.com>
--CC: Xiubo Li <Li.Xiubo@freescale.com>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Acked-by: Bill Pringlemeir <bpringle@sympatico.ca>
Acked-by: Cory Tusar <cory.tusar@pid1solutions.com>
Acked-by: Yuan Yao <yao.yuan@freescale.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>