dt-bindings: hwmon: Add bindings for ADM1266

Add bindings for the Analog Devices ADM1266 sequencer.

Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200812142055.9213-7-alexandru.tachici@analog.com


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