arm64: dts: rockchip: add vdd_cpu_big regulators to rock-5a

The RK8602 and RK8603 voltage regulators on the Rock 5A board provide
the power lines vdd_cpu_big0 and vdd_cpu_big1, respectively.

Add the necessary device tree nodes and bind them to the corresponding
CPU big core nodes.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20230710165228.105983-5-sebastian.reichel@collabora.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>