dt-bindings: hwmon/pmbus: Document MAX20826 and similar devices

The MAX20826 IC and similar provide a high-density, flexible and scalable
dual-loop solution for high current cores for AI applications. These are
dual loop solutions multiphase voltage regulators. Between Rails A and B,
MAX20855B and MAX20908 supports up to 8 phases total configurable from
8+0 to 4+4 phases, MAX20912 supports up to 12 phases from 12+0 to 6+6,
and MAX20826 and MAX20916 supports up to 16 phases from 16+0 to 8+8.

The output voltage of each rail is controlled either through PMBus or
through the high-speed processor voltage-control interface (Intel SVID,
AMD SVI3, Nvidia PWMVID or AVSBus, depending on the device). Which one is
in use is part of the configuration the device powers up with and is read
back from it, hence adi,rail-a-high-speed and adi,rail-b-high-speed only
tell whether the high-speed interface or PMBus controls the output voltage
of the respective rail.

Co-developed-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260911-hwmon-max20826-support-v2-3-5e30cbd97d84@analog.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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