ASoC: Fix WM8580 CLKSEL mask selection

The RX and TX directions were inverted.

Reported-by: Seungwhan Youn <claude.youn@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>