dt-bindings: arm: update sama5d2-icp board documentation

Update Documentation to match patches sent upstream.

Link: https://lore.kernel.org/linux-arm-kernel/20200410164320.7658-2-cristian.birsan@microchip.com
Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>

Author: cristibirsan

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

@@ -77,14 +77,14 @@ properties:
           - const: atmel,sama5d2
           - const: atmel,sama5
 
-      - description: Microchip SAMA5D27 Industrial Connectivity Platform
-        items:
-          - const: microchip,sama5d2-icp
+      - items:
           - const: atmel,sama5d27
           - const: atmel,sama5d2
           - const: atmel,sama5
 
-      - items:
+      - description: Microchip SAMA5D2 Industrial Connectivity Platform
+        items:
+          - const: microchip,sama5d2-icp
           - const: atmel,sama5d27
           - const: atmel,sama5d2
           - const: atmel,sama5