dt-bindings: hwmon: convert AD ADM1275 bindings to dt-schema

Convert the Analog Devices ADM1275 bindings to dt-schema.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201117220807.208747-4-krzk@kernel.org


[groeck: Removed unnecessary type ($ref) declaration]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>