ASoC: nau8825: Add pre-charge actions for input

Adding pre-charge actions to make FEPGA power stable faster. It
improve the recording quality at the beginning. Thus, it is also
meaningfully to decrease the final adc delay time.

Signed-off-by: David Lin <CTLIN0@nuvoton.com>
Link: https://lore.kernel.org/r/20230523083303.98436-1-CTLIN0@nuvoton.com


Signed-off-by: Mark Brown <broonie@kernel.org>