ASoC: dt-bindings: nau8825: Add delay control for input path

Change the original fixed delay to the assignment from property. It will make
more flexible to different platforms for avoiding pop noise at the beginning
of recording.

Signed-off-by: David Lin <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/nau8825.txt

···
   - nuvoton,adcout-drive-strong: make the drive strength of ADCOUT IO PIN strong if set.
       Otherwise, the drive keeps normal strength.
 
+  - nuvoton,adc-delay-ms: Delay (in ms) to make input path stable and avoid pop noise. The
+      default value is 125 and range between 125 to 500 ms.
+
   - 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