dt-bindings: arm: amlogic: add support for the Beelink GS-King-X

The Shenzen AZW (Beelink) GS-King-X is based on the Amlogic W400 reference
board with an S922X-H chip.
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20210119145734.12675-2-christianshewitt@gmail.com

Documentation/devicetree/bindings/arm/amlogic.yaml

@@ -151,6 +151,7 @@ properties:
       - description: Boards with the Amlogic Meson G12B S922X SoC
         items:
           - enum:
+              - azw,gsking-x
               - azw,gtking
               - azw,gtking-pro
               - hardkernel,odroid-n2