dt-bindings: dmaengine: dma-common: Fix the dma-channel-mask property

The commit b37e3534 ("dt-bindings: dmaengine: Add YAML schemas
for the generic DMA bindings") changed the property from
dma-channel-mask to dma-channel-masks. So, this patch fixes it.

Fixes: b37e3534 ("dt-bindings: dmaengine: Add YAML schemas for the generic DMA bindings")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>

Link: https://lore.kernel.org/r/1566988223-14657-1-git-send-email-yoshihiro.shimoda.uh@renesas.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

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

@@ -24,7 +24,7 @@ properties:
     description:
       Used to provide DMA controller specific information.
 
-  dma-channel-masks:
+  dma-channel-mask:
     $ref: /schemas/types.yaml#definitions/uint32
     description:
       Bitmask of available DMA channels in ascending order that are