ASoC: dt-bindings: Do not override firmware-name $ref

dtschema package defines firmware-name as string-array, so individual
bindings should not make it a string but instead just narrow the number
of expected firmware file names.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240115182017.1610055-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/fsl,easrc.yaml

@@ -51,8 +51,8 @@ properties:
       - const: ctx3_tx
 
   firmware-name:
-    $ref: /schemas/types.yaml#/definitions/string
-    const: imx/easrc/easrc-imx8mn.bin
+    items:
+      - const: imx/easrc/easrc-imx8mn.bin
     description: The coefficient table for the filters
 
   fsl,asrc-rate:

Documentation/devicetree/bindings/sound/infineon,peb2466.yaml

@@ -51,7 +51,7 @@ properties:
     maxItems: 1
 
   firmware-name:
-    $ref: /schemas/types.yaml#/definitions/string
+    maxItems: 1
     description:
       Filters coefficients file to load. If this property is omitted, internal
       filters are disabled.