dt-bindings: dmaengine: Add compatible for Tegra234

Document the compatible string used by GPCDMA controller for Tegra234.
Signed-off-by: NAkhil R <akhilrajeev@nvidia.com>
Reviewed-by: NJon Hunter <jonathanh@nvidia.com>
Acked-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220720104045.16099-2-akhilrajeev@nvidia.comSigned-off-by: NVinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml

@@ -23,7 +23,9 @@ properties:
     oneOf:
       - const: nvidia,tegra186-gpcdma
       - items:
-          - const: nvidia,tegra194-gpcdma
+          - enum:
+              - nvidia,tegra234-gpcdma
+              - nvidia,tegra194-gpcdma
           - const: nvidia,tegra186-gpcdma
 
   "#dma-cells":