rockchip: px30: sync the main px30 dtsi from mainline

There have been multiple peripherals added to the main px30 dtsi
in the Linux kernel since its addition to u-boot. So to make it easier
to sync board devicetrees, update the core dtsi from Linux.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>