dt-bindings: ARM: at91: Document Microchip SAMA7G54 Curiosity

Document device tree binding of the Microchip SAMA7G54 Curiosity board.
Signed-off-by: Mihai Sain <mihai.sain@microchip.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240215091524.14732-2-mihai.sain@microchip.comSigned-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>

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

@@ -179,6 +179,12 @@ properties:
           - const: microchip,sama7g5
           - const: microchip,sama7
 
+      - description: Microchip SAMA7G54 Curiosity Board
+        items:
+          - const: microchip,sama7g54-curiosity
+          - const: microchip,sama7g5
+          - const: microchip,sama7
+
       - description: Microchip LAN9662 Evaluation Boards.
         items:
           - enum: