dt-bindings: gpu: samsung-rotator: Fix indentation

Array elements under 'items' should be indented.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/gpu/samsung-rotator.yaml

@@ -27,7 +27,7 @@ properties:
 
   clock-names:
     items:
-    - const: rotator
+      - const: rotator
 
 required:
   - compatible