ASoC: adau1372: add missing dependencies

SND_SOC_ADAU1372_I2C and SND_SOC_ADAU1372_SPI prpoerly select the REGMAP
config they need but forget to depend on the underlying bus.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20201130215626.2400999-1-alexandre.belloni@bootlin.com


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