blackfin: dma: current count mmr is read only

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>

arch/blackfin/include/asm/dma.h

@@ -316,8 +316,6 @@ static inline void disable_dma(unsigned int channel)
 }
 static inline void enable_dma(unsigned int channel)
 {
-	dma_ch[channel].regs->curr_x_count = 0;
-	dma_ch[channel].regs->curr_y_count = 0;
 	dma_ch[channel].regs->cfg |= DMAEN;
 }
 int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data);