ARM/ASoC: OMAP McBSP: Move remainig defines from arch to ASoC header

Clock signal muxing, and functional clock related defines are only needed
in ASoC drivers.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Mark Brown <broonoie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@ti.com>