dt-bindings: dmaengine: dma-common: Change dma-channel-mask to uint32-array

Make the dma-channel-mask to be usable for controllers with more than 32
channels.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20191025073056.25450-2-peter.ujfalusi@ti.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/dma/dma-common.yaml

@@ -25,11 +25,18 @@ properties:
       Used to provide DMA controller specific information.
 
   dma-channel-mask:
-    $ref: /schemas/types.yaml#definitions/uint32
     description:
       Bitmask of available DMA channels in ascending order that are
       not reserved by firmware and are available to the
       kernel. i.e. first channel corresponds to LSB.
+      The first item in the array is for channels 0-31, the second is for
+      channels 32-63, etc.
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32-array
+    items:
+      minItems: 1
+      # Should be enough
+      maxItems: 255
 
   dma-channels:
     $ref: /schemas/types.yaml#definitions/uint32