dt-bindings: ipmi: Add npcm845 compatible

Add a compatible string for Nuvoton BMC NPCM845 KCS and modify NPCM KCS
description to support all NPCM BMC SoC.
Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Message-Id: <20220717121124.154734-2-tmaimon77@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

Documentation/devicetree/bindings/ipmi/npcm7xx-kcs-bmc.txt

-* Nuvoton NPCM7xx KCS (Keyboard Controller Style) IPMI interface
+* Nuvoton NPCM KCS (Keyboard Controller Style) IPMI interface
 
-The Nuvoton SOCs (NPCM7xx) are commonly used as BMCs
+The Nuvoton SOCs (NPCM) are commonly used as BMCs
 (Baseboard Management Controllers) and the KCS interface can be
 used to perform in-band IPMI communication with their host.
 
 Required properties:
 - compatible : should be one of
     "nuvoton,npcm750-kcs-bmc"
+    "nuvoton,npcm845-kcs-bmc"
 - interrupts : interrupt generated by the controller
 - kcs_chan : The KCS channel number in the controller