dt-bindings: hwmon: Document the LTC4283 Swap Controller

The LTC4283 is a negative voltage hot swap controller that drives an
external N-channel MOSFET to allow a board to be safely inserted and
removed from a live backplane.

Special note for the "adi,vpower-drns-enable" property. It allows to choose
between the attenuated MOSFET drain voltage or the attenuated input
voltage at the RTNS pin (effectively choosing between input or output
power). This is a system level decision not really intended to change at
runtime and hence is being added as a Firmware property.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20260502-ltc4283-support-v13-1-1c206542e652@analog.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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