dt-bindings: arm: at91: Add info on SAMA5D3-EDS

Adding the SAMA5D3-EDS board from Microchip into the atmel AT91 board
description yaml file.
Signed-off-by: Jerry Ray <jerry.ray@microchip.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220909163022.13022-1-jerry.ray@microchip.com

Documentation/devicetree/bindings/arm/atmel-at91.yaml

@@ -127,6 +127,13 @@ properties:
           - const: atmel,sama5d3
           - const: atmel,sama5
 
+      - description: Microchip SAMA5D3 Ethernet Development System Board
+        items:
+          - const: microchip,sama5d3-eds
+          - const: atmel,sama5d36
+          - const: atmel,sama5d3
+          - const: atmel,sama5
+
       - description: CalAmp LMU5000 board
         items:
           - const: calamp,lmu5000