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 rk3188.dtsi 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: NBeniamino Galvani <b.galvani@gmail.com>
Acked-by: NRomain Perier <romain.perier@gmail.com>
Acked-by: NJulien Chauveau <chauveau.julien@gmail.com>
Acked-by: NMax Schwarz <max.schwarz@online.de>