dt-bindings: hwmon: Add bindings for max31760

Adding bindings for Analog Devices MAX31760 Fan-Speed Controller

Signed-off-by: Ibrahim Tilki <Ibrahim.Tilki@analog.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220910171945.48088-4-Ibrahim.Tilki@analog.com


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