ARM: Samsung: Make sure ASoC DMA device is prototyped

Ensure that the prototype agrees with the definition and stop sparse
complaining when building the file.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Acked-by: Jassi Brar <jassi.brar@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

arch/arm/plat-samsung/dev-asocdma.c

@@ -10,6 +10,7 @@
 
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
+#include <plat/devs.h>
 
 static u64 audio_dmamask = DMA_BIT_MASK(32);