As SSI has dual fifo, add src_dualfifo and dst_dualfifo in imx_dma_data to support dual fifo in DMA_DEV_TO_DEV. Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com> (cherry picked from commit cfde1308f170166a0099ca39ee8733895f9626f0)