Blackfin arch: add set_dma_curr_addr DMA API to support sound driver recording function

Signed-off-by: Roy Huang <roy.huang@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/include/asm-blackfin/dma.h b/include/asm-blackfin/dma.h
index be0d913..4269082 100644
--- a/include/asm-blackfin/dma.h
+++ b/include/asm-blackfin/dma.h
@@ -159,6 +159,7 @@
 void set_dma_config(unsigned int channel, unsigned short config);
 unsigned short set_bfin_dma_config(char direction, char flow_mode,
 				   char intr_mode, char dma_mode, char width);
+void set_dma_curr_addr(unsigned int channel, unsigned long addr);
 
 /* get curr status for polling */
 unsigned short get_dma_curr_irqstat(unsigned int channel);