The file <board name>-u-boot.dtsi inculde automatically by the build
system, no need to add this to dts file.
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Add px30 related devicetrees synced from the Linux kernel.
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>