arm64: dts: rockchip: refactor common rk3588-orangepi-5.dtsi

Orange Pi now has multiple SBCs using the RK3588.

Refactor the common parts of the Orange Pi 5 Plus DTS so it can be
shared with the 5 Max and the 5 Ultra.

Signed-off-by: Jimmy Hon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Stuebner <[email protected]>

Author: jimmyhon