ARM: dts: rockchip: add veyron-tiger board

Also known as the AOpen Chromebase Mini.

tiger and fievel are share the same board, tiger has a display and
touchscreen, fievel not. Use the fievel .dts as base and add the
extra bits.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>