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 rk3288-evb files to this combination.

CCs were aquired by git shortlog -sne so it should've hopefully catched
every contributor.
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Acked-by: NDoug Anderson <dianders@chromium.org>
Acked-by: NKever Yang <kever.yang@rock-chips.com>
Acked-by: NCaesar Wang <caesar.wang@rock-chips.com>
Acked-by: NRomain Perier <romain.perier@gmail.com>
Acked-by: Chris Zhong<zyw@rock-chips.com>
Acked-by: NRoger Chen <roger.chen@rock-chips.com>
Acked-by: NYunzhi Li <lyz@rock-chips.com>

on behalf of Rockchip
Acked-by: NEddie Cai <eddie.cai@rock-chips.com>