Blackfin arch: add get_dma_config() func to match set_dma_config()

Signed-off-by: NMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>

arch/blackfin/include/asm/dma.h

@@ -195,6 +195,10 @@ static inline void *get_dma_curr_desc_ptr(unsigned int channel)
 {
 	return dma_ch[channel].regs->curr_desc_ptr;
 }
+static inline unsigned short get_dma_config(unsigned int channel)
+{
+	return dma_ch[channel].regs->cfg;
+}
 static inline unsigned long get_dma_curr_addr(unsigned int channel)
 {
 	return dma_ch[channel].regs->curr_addr_ptr;