dt-bindings: hwmon: npcm: Add npcm845 compatible string

Add a compatible string for Nuvoton BMC NPCM845 Pulse Width Modulation
(PWM) and Fan tach controller.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20231018181925.1826042-2-tmaimon77@gmail.com


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