ASoC: samsung: Fix build error with dma function rename

commit 85ff3c29 ("ASoC: samsung: Rename DMA platform registration
functions") renames the DMA registration functions. Fix the places where
it was left out.

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>