Max voltages in OPP table are irreleavant for Pinephone Pro DT, because the CPU
regulators in the PMIC are capable of setting the preferred voltage or very
close to it.
The actual min/max limits that are enforced by the kernel for the board are set
on the CPU regulator, which are actually wrongly set in this DT. See:
https://dl.radxa.com/rockpi4/docs/hw/datasheets/Rockchip%20RK3399-T%20Datasheet%20V1.0-20210818.pdf