ASoC: ak5558: correct reset polarity

Reset (aka power off) happens when the reset gpio is made active.
The reset gpio is GPIO_ACTIVE_LOW

Fixes: 92088477 ("ASoC: ak5558: Add support for AK5558 ADC driver")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1618382024-31725-1-git-send-email-shengjiu.wang@nxp.com


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