dt-bindings: arm: realtek: Add Realtek Lion Skin EVB

Define a compatible string for Realtek RTD1395 Lion Skin eval board.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Andreas Färber <afaerber@suse.de>

Documentation/devicetree/bindings/arm/realtek.yaml

@@ -45,5 +45,6 @@ properties:
       - items:
           - enum:
               - bananapi,bpi-m4 # Banana Pi BPI-M4
+              - realtek,lion-skin # Realtek Lion Skin EVB
           - const: realtek,rtd1395
 ...