dt-bindings: dma: Add dma-channel-mask to nvidia,tegra210-adma

Add dma-channel-mask binding doc support to nvidia,tegra210-adma
to reserve the adma channel usage

Acked-by: Rob Herring <[e-mail]>
Signed-off-by: Mohan Kumar <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

Documentation/devicetree/bindings/dma/nvidia,tegra210-adma.yaml

···
       ADMA_CHn_CTRL register.
     const: 1
 
+  dma-channel-mask:
+    maxItems: 1
+
 required:
   - compatible
   - reg