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>

Author: tmaimon

Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.txt

@@ -1,12 +1,16 @@
-Nuvoton NPCM7xx PWM and Fan Tacho controller device
+Nuvoton NPCM PWM and Fan Tacho controller device
 
 The Nuvoton BMC NPCM7XX supports 8 Pulse-width modulation (PWM)
 controller outputs and 16 Fan tachometer controller inputs.
 
+The Nuvoton BMC NPCM8XX supports 12 Pulse-width modulation (PWM)
+controller outputs and 16 Fan tachometer controller inputs.
+
 Required properties for pwm-fan node
 - #address-cells : should be 1.
 - #size-cells	: should be 0.
 - compatible	: "nuvoton,npcm750-pwm-fan" for Poleg NPCM7XX.
+				: "nuvoton,npcm845-pwm-fan" for Arbel NPCM8XX.
 - reg			: specifies physical base address and size of the registers.
 - reg-names	: must contain:
 					* "pwm" for the PWM registers.