ASoC: s3c24xx: Fix compilation problem for mini2440

When make mini2440_defconfig compilation end with undefined
references to DMA functions. There was missing selection
for S3C2410_DMA when compile ASoC audio for S3C24xx CPU.
Tested on mini2440 board.

Signed-off-by: Marek Belisko <marek.belisko@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>