dt-bindings: mmc: tegra: Document Tegra234 SDHCI

Add the compatible string for the SDHCI block found on the Tegra234 SoC.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.yaml

@@ -33,6 +33,12 @@ properties:
           - const: nvidia,tegra132-sdhci
           - const: nvidia,tegra124-sdhci
 
+      - items:
+          - enum:
+              - nvidia,tegra194-sdhci
+              - nvidia,tegra234-sdhci
+          - const: nvidia,tegra186-sdhci
+
   reg:
     maxItems: 1