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