arm64: dts: rockchip: add PMIC to rock-5b

This adds PMIC support for the Radxa ROCK 5B

Signed-off-by: shengfei Xu <xsf@rock-chips.com>
Co-developed-by: shengfei Xu <xsf@rock-chips.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20230529170532.59804-1-sebastian.reichel@collabora.com


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