ASoC: samsung: Rename DMA platform registration functions

The current naming with a simple asoc_ prefix is too generic for use in
multiplatform kernels.

Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Sangbeom Kim <sbkim73@samsung.com>

diff --cc sound/soc/samsung/ac97.c
Simple merge

diff --cc sound/soc/samsung/dma.c
Simple merge

diff --cc sound/soc/samsung/dma.h
Simple merge

diff --cc sound/soc/samsung/i2s.c
Simple merge