ASoC: Fix __iomem annotation for IDMA registers

We always store the register address as __iomem but pass it around as a
plain void * which upsets sparse.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/samsung/idma.h b/sound/soc/samsung/idma.h
index 4827321..8644946 100644
--- a/sound/soc/samsung/idma.h
+++ b/sound/soc/samsung/idma.h
@@ -14,7 +14,7 @@
 #ifndef __SND_SOC_SAMSUNG_IDMA_H_
 #define __SND_SOC_SAMSUNG_IDMA_H_
 
-extern void idma_reg_addr_init(void *regs, dma_addr_t addr);
+extern void idma_reg_addr_init(void __iomem *regs, dma_addr_t addr);
 
 /* dma_state */
 #define LPAM_DMA_STOP	0