dt-bindings: hwmon: pmbus: adp1050: add bindings

Add dt-bindings for adp1050 digital controller for isolated power supply
with pmbus interface voltage, current and temperature monitor.

Signed-off-by: Radu Sabau <radu.sabau@analog.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20240321142201.10330-1-radu.sabau@analog.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>