dt-bindings: media: mediatek: mdp3: add config for MT8195 RDMA

Added the configuration for MT8195 RDMA. In comparison to MT8183, it
no longer shares SRAM with RSZ, and there are now preconfigured 5 mbox.

Signed-off-by: Moudy Ho <[e-mail]>
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: AngeloGioacchino Del Regno <[e-mail]>

Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml

···
     oneOf:
       - enum:
           - mediatek,mt8183-mdp3-rdma
+          - mediatek,mt8195-mdp3-rdma
           - mediatek,mt8195-vdo1-rdma
       - items:
           - const: mediatek,mt8188-vdo1-rdma
···
     items:
       - description: used for 1st data pipe from RDMA
       - description: used for 2nd data pipe from RDMA
+      - description: used for 3rd data pipe from RDMA
+      - description: used for 4th data pipe from RDMA
+      - description: used for the data pipe from SPLIT
     minItems: 1
 
   interrupts:
···
 
       required:
         - mboxes
+        - mediatek,gce-events
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mediatek,mt8195-mdp3-rdma
+
+    then:
+      properties:
+        clocks:
+          maxItems: 1
+
+        mboxes:
+          minItems: 5
+
+      required:
         - mediatek,gce-events
 
   - if: