ASoC: tlv320aic31xx: Add CODEC clock slave support

This CODEC supports being the WCLK and/or BCLK slave, add
support for this here.

Also make the alert into an error as alert is more urgent
than needed here and is rarely used.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>