dt-bindings: arm: amlogic: add odroid-c4 bindings

Add the board bindings for the Hardkernel Odroid-C4 single board computer.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200506080702.6645-2-narmstrong@baylibre.com

Documentation/devicetree/bindings/arm/amlogic.yaml

@@ -159,6 +159,7 @@ properties:
           - enum:
               - seirobotics,sei610
               - khadas,vim3l
+              - hardkernel,odroid-c4
           - const: amlogic,sm1
 
       - description: Boards with the Amlogic Meson A1 A113L SoC