dt-bindings: display: tegra: document Tegra30 VI and VIP

Existing Parallel VI interface schema for Tegra20 is fully compatible with
Tegra30; hence, lets reuse it by setting fallback for Tegra30.

Adjust existing VI schema to reflect that Tegra20 VI is compatible with
Tegra30 by setting a fallback for Tegra30. Additionally, switch to using
an enum instead of list of const.

Signed-off-by: Svyatoslav Ryhel <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Tested-by: Luca Ceresoli <[e-mail]> # tegra20, parallel camera
Signed-off-by: Thierry Reding <[e-mail]>

Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-vi.yaml

···
 
   compatible:
     oneOf:
-      - const: nvidia,tegra20-vi
-      - const: nvidia,tegra30-vi
-      - const: nvidia,tegra114-vi
-      - const: nvidia,tegra124-vi
+      - enum:
+          - nvidia,tegra20-vi
+          - nvidia,tegra114-vi
+          - nvidia,tegra124-vi
+          - nvidia,tegra210-vi
+          - nvidia,tegra186-vi
+          - nvidia,tegra194-vi
+
+      - items:
+          - const: nvidia,tegra30-vi
+          - const: nvidia,tegra20-vi
+
       - items:
           - const: nvidia,tegra132-vi
           - const: nvidia,tegra124-vi
-      - const: nvidia,tegra210-vi
-      - const: nvidia,tegra186-vi
-      - const: nvidia,tegra194-vi
 
   reg:
     maxItems: 1

Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-vip.yaml

···
 
 properties:
   compatible:
-    enum:
-      - nvidia,tegra20-vip
+    oneOf:
+      - enum:
+          - nvidia,tegra20-vip
+
+      - items:
+          - const: nvidia,tegra30-vip
+          - const: nvidia,tegra20-vip
 
   ports:
     $ref: /schemas/graph.yaml#/properties/ports