dt-bindings: display: mediatek: clean unnecessary item

The item which have the mediatek,mt8192-disp-ccorr as const compatible
already exist above. Merge all compatibles which have the same fallback
under the same item.

Acked-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Alexandre Mergnat <[e-mail]>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/[e-mail]/
Signed-off-by: Chun-Kuang Hu <[e-mail]>

Documentation/devicetree/bindings/display/mediatek/mediatek,ccorr.yaml

···
           - const: mediatek,mt8192-disp-ccorr
       - items:
           - enum:
+              - mediatek,mt8186-disp-ccorr
               - mediatek,mt8188-disp-ccorr
               - mediatek,mt8195-disp-ccorr
-          - const: mediatek,mt8192-disp-ccorr
-      - items:
-          - enum:
-              - mediatek,mt8186-disp-ccorr
           - const: mediatek,mt8192-disp-ccorr
 
   reg: