ASoC: DaVinci: use edma_pause, edma_resume

Use edma_pause and edma_resume to make missing dma_events
less likely. This may not be needed, but it looks better.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>