ARM: dts: rockchip: add basic dtsi file for RK3229 SoC

Due to some tiny differences between RK3228 and RK3229, this patch adds
a basic dtsi file which first includes a new CPU opp table for RK3229.

Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>