arm64: dts: rockchip: add core dtsi for RK3562 SoC

RK3562 is a SoC from Rockchip, which embedded with quad
ARM Cortex-A53.

Signed-off-by: Finley Xiao <[email protected]>
Signed-off-by: Kever Yang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Stuebner <[email protected]>

Author: finley1226