ASoC: ak4642: Replace mdelay function to msleep

Replace mdelay to msleep to avoid busy loop on ak4642_lout_event().
Otherwise, sometimes playback doesn't work correctly when pulseaudio
was used.
Signed-off-by: Harunobu Kurokawa <harunobu.kurokawa.dn@renesas.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/ak4642.c

@@ -189,7 +189,7 @@ static int ak4642_lout_event(struct snd_soc_dapm_widget *w,
 	case SND_SOC_DAPM_POST_PMU:
 	case SND_SOC_DAPM_POST_PMD:
 		/* Power save mode OFF */
-		mdelay(300);
+		msleep(300);
 		snd_soc_update_bits(codec, SG_SL2, LOPS, 0);
 		break;
 	}