dt-bindings: display/msm/gmu: Add Adreno X2-85 GMU

Document Adreno X2-85 GMU found in Glymur chipsets in the
dt-binding specification. It is very similar to Adreno 840
GMU with the additional requirement of RSCC HUB clock.

Acked-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Akhil P Oommen <[e-mail]>
Patchwork: https://patchwork.freedesktop.org/patch/689032/
Message-ID: <[e-mail]>
Signed-off-by: Rob Clark <[e-mail]>

Documentation/devicetree/bindings/display/msm/gmu.yaml

···
       properties:
         compatible:
           contains:
+            const: qcom,adreno-gmu-x285.1
+    then:
+      properties:
+        reg:
+          items:
+            - description: Core GMU registers
+        reg-names:
+          items:
+            - const: gmu
+        clocks:
+          items:
+            - description: GPU AHB clock
+            - description: GMU clock
+            - description: GPU CX clock
+            - description: GPU MEMNOC clock
+            - description: GMU HUB clock
+            - description: GMU RSCC HUB clock
+        clock-names:
+          items:
+            - const: ahb
+            - const: gmu
+            - const: cxo
+            - const: memnoc
+            - const: hub
+            - const: rscc
+
+  - if:
+      properties:
+        compatible:
+          contains:
             const: qcom,adreno-gmu-wrapper
     then:
       properties: