arm: dts: rockchip: move all rk322x u-boot specific properties in separate dtsi files

In order to sync rk322x.dtsi from Linux, move all
U-boot specific properties in separate dtsi files.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>