dt-bindings: dma: fsl-edma: fix dma-channels constraints

dma-channels is a number, not a list.  Apply proper constraints on the
actual number.

Fixes: 6eb439d ("dt-bindings: fsl-dma: fsl-edma: add edma3 compatible string")
Cc: [email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Peng Fan <[email protected]>
Acked-by: Rob Herring (Arm) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: krzk

Documentation/devicetree/bindings/dma/fsl,edma.yaml

@@ -59,8 +59,8 @@ properties:
       - 3
 
   dma-channels:
-    minItems: 1
-    maxItems: 64
+    minimum: 1
+    maximum: 64
 
   clocks:
     minItems: 1