dt-bindings: hwmon: Add bindings for mpq8785 driver

Add device tree bindings for Monolithic Power Systems MPQ8785, MPM82504
and MPM3695 PMBus-compliant voltage regulators.

These bindings also documents the optional
"mps,vout-fb-divider-ratio-permille" property.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250511035701.2607947-2-paweldembicki@gmail.com


Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>