In the Linux DT the file rk3xxx.dtsi is shared between rk3066 and rk3188. Add rk3066a.dtsi. Move U-boot specific things in a rk3066a-u-boot.dtsi file. Signed-off-by: Johan Jonker <jbx6244@gmail.com> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>