dt-bindings: arm: add sam9x75 curiosity board

Add documentation for SAM9X75 Curiosity board.

Signed-off-by: Varshini Rajendran <[email protected]>
Acked-by: Rob Herring <[email protected]>
Reviewed-by: Claudiu Beznea <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Claudiu Beznea <[email protected]>

Author: varshini-rajendran

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

@@ -106,6 +106,12 @@ properties:
           - const: microchip,sam9x60
           - const: atmel,at91sam9
 
+      - description: Microchip SAM9X7 Evaluation Boards
+        items:
+          - const: microchip,sam9x75-curiosity
+          - const: microchip,sam9x7
+          - const: atmel,at91sam9
+
       - description: Nattis v2 board with Natte v2 power board
         items:
           - const: axentia,nattis-2