arm64: dts: rockchip: fix pmu_io supply for Lunzn Fastrhino R6xS

arm64: dts: rockchip: fix pmu_io supply for Lunzn Fastrhino R6xS

Fixes pmu_io_domains supply according to the schematic. Among them,
the vccio3 is responsible for the io voltage of sdcard. There is no
sdcard slot on the R68S, and it's connected to vcc_3v3, so describe
the supply of vccio3 separately.

Fixes: c79dab407afd ("arm64: dts: rockchip: Add Lunzn Fastrhino R66S")
Fixes: b9f8ca655d80 ("arm64: dts: rockchip: Add Lunzn Fastrhino R68S")
Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Link: https://lore.kernel.org/r/20240630150010.55729-4-amadeus@jmu.edu.cn
Signed-off-by: Heiko Stuebner <heiko@sntech.de>