ASoC: dt-bindings: ak4458: Add dsd-path property

Add "dsd-path" property, which is used for ak4497 codec
to select the DSD input pin.
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1600178220-28973-1-git-send-email-shengjiu.wang@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/ak4458.txt

@@ -12,6 +12,9 @@ Optional properties:
 - mute-gpios: A GPIO specifier for the soft mute pin
 - AVDD-supply: Analog power supply
 - DVDD-supply: Digital power supply
+- dsd-path: Select DSD input pins for ak4497
+            0: select #16, #17, #19 pins
+            1: select #3, #4, #5 pins
 
 Example: