ASoC: dt-bindings: qcom,wcd934x: use absolute path to other schema

Absolute path to other DT schema is preferred over relative one.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220726115917.101371-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/qcom,wcd934x.yaml

@@ -127,7 +127,7 @@ properties:
 
   gpio@42:
     type: object
-    $ref: ../gpio/qcom,wcd934x-gpio.yaml#
+    $ref: /schemas/gpio/qcom,wcd934x-gpio.yaml#
 
 patternProperties:
   "^.*@[0-9a-f]+$":