dt-bindings: dma: atmel: add microchip,lan9691-dma

Document Microchip LAN969x DMA compatible which is compatible to SAMA7G5.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20251229184004.571837-10-robert.marko@sartura.hr
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/dma/atmel,sama5d4-dma.yaml

@@ -33,7 +33,9 @@ properties:
               - microchip,sam9x7-dma
           - const: atmel,sama5d4-dma
       - items:
-          - const: microchip,sama7d65-dma
+          - enum:
+              - microchip,lan9691-dma
+              - microchip,sama7d65-dma
           - const: microchip,sama7g5-dma
 
   "#dma-cells":