ASoC: dt-bindings: microchip,sama7g5-pdmc: Simplify "microchip,mic-pos" constraints

"enum" values should be integers or strings, not arrays (though json-schema
does allow arrays, we do not). In this case, all possible combinations are
allowed anyways, so there's little point in expressing as an array.
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/Message-Id: <20230621231044.3816914-1-robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml

@@ -56,13 +56,9 @@ properties:
     items:
       items:
         - description: value for DS line
+          enum: [0, 1]
         - description: value for sampling edge
-      anyOf:
-        - enum:
-            - [0, 0]
-            - [0, 1]
-            - [1, 0]
-            - [1, 1]
+          enum: [0, 1]
     minItems: 1
     maxItems: 4
     uniqueItems: true