ASoC: dt-bindings: ak5558: Add compatible string for ak5552

Add compatible string "asahi-kasei,ak5552" for ak5552
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1617176686-25528-2-git-send-email-shengjiu.wang@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/ak5558.txt

@@ -4,7 +4,7 @@ This device supports I2C mode only.
 
 Required properties:
 
-- compatible : "asahi-kasei,ak5558"
+- compatible : "asahi-kasei,ak5558" or "asahi-kasei,ak5552".
 - reg : The I2C address of the device.
 
 Optional properties: