dt-bindings: arm: tegra: Document Jetson Xavier NX eMMC SKU

Two different SKUs exist for the Jetson Xavier NX module, so document
the compatible strings for both, as well as the developer kits that come
with each of the SKUs.
Signed-off-by: Thierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/arm/tegra.yaml

@@ -120,10 +120,18 @@ properties:
         items:
           - const: nvidia,p3668-0000
           - const: nvidia,tegra194
+      - description: Jetson Xavier NX (eMMC)
+        items:
+          - const: nvidia,p3668-0001
+          - const: nvidia,tegra194
       - description: Jetson Xavier NX Developer Kit
         items:
           - const: nvidia,p3509-0000+p3668-0000
           - const: nvidia,tegra194
+      - description: Jetson Xavier NX Developer Kit (eMMC)
+        items:
+          - const: nvidia,p3509-0000+p3668-0001
+          - const: nvidia,tegra194
       - items:
           - enum:
               - nvidia,tegra234-vdk