ASoC: dt-bindings: nau8825: Add ADCOUT IO drive strength control

Add a property to control the driving of ADCOUT.
Signed-off-by: David Lin <CTLIN0@nuvoton.com>
Link: https://lore.kernel.org/r/20220913120641.792502-2-CTLIN0@nuvoton.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/nau8825.txt

@@ -71,6 +71,9 @@ Optional properties:
 
   - nuvoton,crosstalk-enable: make crosstalk function enable if set.
 
+  - nuvoton,adcout-drive-strong: make the drive strength of ADCOUT IO PIN strong if set.
+      Otherwise, the drive keeps normal strength.
+
   - clocks: list of phandle and clock specifier pairs according to common clock bindings for the
       clocks described in clock-names
   - clock-names: should include "mclk" for the MCLK master clock