dt-bindings: arm: Document emtrion emCON-MX6 bindings

Document the compatible strings for emtrion emCON-MX6 SoM's.

Signed-off-by: Jan Tuerk <jan.tuerk@emtrion.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/Documentation/devicetree/bindings/arm/emtrion.txt b/Documentation/devicetree/bindings/arm/emtrion.txt
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+Emtrion Devicetree Bindings
+===========================
+
+emCON Series:
+-------------
+
+Required root node properties
+       - compatible:
+       - "emtrion,emcon-mx6", "fsl,imx6q";             : emCON-MX6D or emCON-MX6Q SoM
+       - "emtrion,emcon-mx6-avari", "fsl,imx6q";       : emCON-MX6D or emCON-MX6Q SoM on Avari Base
+       - "emtrion,emcon-mx6", "fsl,imx6dl";            : emCON-MX6S or emCON-MX6DL SoM
+       - "emtrion,emcon-mx6-avari", "fsl,imx6dl";      : emCON-MX6S or emCON-MX6DL SoM on Avari Base