ASoC: cs4271: Remove outdated comment

Commit 1b1861ea ("ASoC: cs4271: convert to direct regmap API usage") removed
the bus_type field from the cs4271_private struct, but left the comment that
described the field in there. This patch removes the comment.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/codecs/cs4271.c

@@ -159,7 +159,6 @@ static bool cs4271_volatile_reg(struct device *dev, unsigned int reg)
 }
 
 struct cs4271_private {
-	/* SND_SOC_I2C or SND_SOC_SPI */
 	unsigned int			mclk;
 	bool				master;
 	bool				deemph;