dt-bindings: arm: fsl: add compatible string for Tolino Shine 3

This adds a compatible string for the Tolino Shine 3 eBook reader.
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/arm/fsl.yaml

@@ -158,6 +158,7 @@ properties:
         items:
           - enum:
               - fsl,imx6sl-evk            # i.MX6 SoloLite EVK Board
+              - kobo,tolino-shine3
           - const: fsl,imx6sl
 
       - description: i.MX6SLL based Boards