dt-bindings: power: supply: max17042: Document max77849-battery

max77849 is a combined fuel-gauge, charger and MUIC device. Add it to
the bindings documentation.
Signed-off-by: Nikita Travkin <nikita@trvn.ru>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Documentation/devicetree/bindings/power/supply/maxim,max17042.yaml

@@ -19,6 +19,7 @@ properties:
       - maxim,max17047
       - maxim,max17050
       - maxim,max17055
+      - maxim,max77849-battery
 
   reg:
     maxItems: 1