dt-bindings: display: mediatek: revise enum to const

There won't be more than 1 fallback for these bindings, so we modify
them to use const instead of enum.

Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20220406030009.2357-2-rex-bc.chen@mediatek.com/Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

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

@@ -29,8 +29,7 @@ properties:
               - mediatek,mt8183-disp-aal
               - mediatek,mt8192-disp-aal
               - mediatek,mt8195-disp-aal
-          - enum:
-              - mediatek,mt8173-disp-aal
+          - const: mediatek,mt8173-disp-aal
 
   reg:
     maxItems: 1

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

@@ -28,8 +28,7 @@ properties:
       - items:
           - enum:
               - mediatek,mt8195-disp-ccorr
-          - enum:
-              - mediatek,mt8192-disp-ccorr
+          - const: mediatek,mt8192-disp-ccorr
 
   reg:
     maxItems: 1

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

@@ -32,15 +32,13 @@ properties:
           - enum:
               - mediatek,mt7623-disp-color
               - mediatek,mt2712-disp-color
-          - enum:
-              - mediatek,mt2701-disp-color
+          - const: mediatek,mt2701-disp-color
       - items:
           - enum:
               - mediatek,mt8183-disp-color
               - mediatek,mt8192-disp-color
               - mediatek,mt8195-disp-color
-          - enum:
-              - mediatek,mt8173-disp-color
+          - const: mediatek,mt8173-disp-color
   reg:
     maxItems: 1
 

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

@@ -28,8 +28,7 @@ properties:
           - enum:
               - mediatek,mt8192-disp-dither
               - mediatek,mt8195-disp-dither
-          - enum:
-              - mediatek,mt8183-disp-dither
+          - const: mediatek,mt8183-disp-dither
 
   reg:
     maxItems: 1

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

@@ -29,8 +29,7 @@ properties:
           - enum:
               - mediatek,mt8192-disp-gamma
               - mediatek,mt8195-disp-gamma
-          - enum:
-              - mediatek,mt8183-disp-gamma
+          - const: mediatek,mt8183-disp-gamma
 
   reg:
     maxItems: 1

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

@@ -33,13 +33,11 @@ properties:
           - enum:
               - mediatek,mt7623-disp-ovl
               - mediatek,mt2712-disp-ovl
-          - enum:
-              - mediatek,mt2701-disp-ovl
+          - const: mediatek,mt2701-disp-ovl
       - items:
           - enum:
               - mediatek,mt8195-disp-ovl
-          - enum:
-              - mediatek,mt8183-disp-ovl
+          - const: mediatek,mt8183-disp-ovl
 
   reg:
     maxItems: 1

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

@@ -35,13 +35,11 @@ properties:
           - enum:
               - mediatek,mt7623-disp-rdma
               - mediatek,mt2712-disp-rdma
-          - enum:
-              - mediatek,mt2701-disp-rdma
+          - const: mediatek,mt2701-disp-rdma
       - items:
           - enum:
               - mediatek,mt8192-disp-rdma
-          - enum:
-              - mediatek,mt8183-disp-rdma
+          - const: mediatek,mt8183-disp-rdma
 
   reg:
     maxItems: 1