[Phosphor-power] psu-ng: Add method to get PSU conf from D-Bus.

[Chanh Nguyen OS]

Hi B. J. Wyman,

I'm using the psu-ng to monitor the PSU. I used the pmbus (https://github.com/openbmc/linux/blob/dev-5.10/Documentation/hwmon/pmbus.rst) driver to support hardware monitoring for the PSU, don't use the ibm-cffps driver (https://github.com/openbmc/linux/blob/dev-5.10/Documentation/hwmon/ibm-cffps.rst)

I don't clear why we fix to use the IBMCFFPSInterface (https://gerrit.openbmc-project.xyz/c/openbmc/phosphor-power/+/38138/10/phosphor-power-supply/psu_manager.cpp#16) ?

Thanks,
Chanh Nguyen

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