ASoC: tlv320aic32x4: always enable dividers

Dividers (such as MDAC) are always needed, independent of the codec
being I2S master or slave. Needed on a custom board where the codec has
to be slave.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Javier Martin <javier.martin@vista-silicon.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>