arm64: dts: rockchip: fixes regulator for 100ASK DshanPi A1

arm64: dts: rockchip: fixes regulator for 100ASK DshanPi A1

Referencing the schematic [1], correct the names of the USB
regulator, remove these non-existent RTC and UFS regulators.

[1] https://dl.100ask.net/Hardware/MPU/RK3576-DshanPi-A1/DshanPi-A1-RK3576-SCH_V1.1.pdf

Fixes: d809417c5a40 ("arm64: dts: rockchip: add DTs for 100ASK DShanPi A1")
Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Link: https://patch.msgid.link/20251101120010.41729-2-amadeus@jmu.edu.cn
Signed-off-by: Heiko Stuebner <heiko@sntech.de>