dt-bindings: arm: nvidia: Document the Tegra238 CCPLEX cluster

Tegra238 is derived from Tegra234 and uses a similar CCPLEX cluster,
with slight variations but the same programming model. Add a compatible
string to specify this particular implementation.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Author: thierryreding

Documentation/devicetree/bindings/arm/tegra/nvidia,tegra-ccplex-cluster.yaml

@@ -24,6 +24,7 @@ properties:
     enum:
       - nvidia,tegra186-ccplex-cluster
       - nvidia,tegra234-ccplex-cluster
+      - nvidia,tegra238-ccplex-cluster
 
   reg:
     maxItems: 1