arm64: dts: rockchip: rk3588s.dtsi: update cpub opp-table

[unifreq]

set the nominal frequency of the large core according to pvtm.
According to the different eight pvtm values, the actual frequency of locking the large core is close to or reaches the nominal value as much as possible.

[unifreq]

Based on some of the test data I've collected, here are some possible results:
pvtm from 0-7, the corresponding nominal frequency upper limit and actual frequency upper limit are:
pvtm0: The nominal frequency can only reach 2256Mhz, the actual frequency is related to the voltage, the result is unknown
pvtm1: The nominal frequency can only reach 2256Mhz, the actual frequency is related to the voltage, the result is unknown
pvtm2: The nominal frequency can only reach 2304Mhz, the actual frequency is related to the voltage, the result is unknown
pvtm3: The nominal frequency can only reach 2352Mhz, the actual frequency is related to the voltage, the result is unknown
pvtm4: The nominal frequency can reach 2400Mhz, the voltage required for the actual frequency to reach 2400Mhz is 1.075v, if the voltage increases, the actual frequency will also increase
pvtm5: The nominal frequency can reach 2400Mhz, the voltage required for the actual frequency to reach 2400Mhz is 1.050v, if the voltage increases, the actual frequency will also increase
pvtm6: The nominal frequency can reach 2400Mhz, the voltage required for the actual frequency to reach 2400Mhz is 1.025v, if the voltage increases, the actual frequency will also increase
pvtm7: The nominal frequency can reach 2400Mhz, the voltage required for the actual frequency to reach 2400Mhz is 1.000v, if the voltage increases, the actual frequency will also increase

[RadxaYuntian]

This is overclocking (by over voltage). I don't think we will make this default. A separate overlay may be better suited for this job.

Edit: Checked against the datasheet and 1.05v is listed as the upper limit of recommended operating condition. So in theory this is within the spec. I think we will need to consulate Rockchip to see why they limited to 1v initially.

[unifreq]

Yes, my setting does not exceed the default upper limit of 1.05v, so I think this solution is feasible.
If you have different opinions on the voltage, you can also keep the upper limit voltage of 1.0v and only change the content of the frequency part, but in doing so, there will be a larger gap between the nominal frequency and the actual frequency.