MLK-16224-5: dma: imx-sdma: support mulit fifo script

MLK-16224-5: dma: imx-sdma: support mulit fifo script

The type IMX_DMATYPE_MULTI_SAI is used for SAI multi-fifo mode,
in this mode, the fifo num parameter is configured through
dma_slave_config

The watermark definition is:
bit0~7: wartermark level
bit8~11: fifo number
bit16~19: fifo offset
bit27~24: sw done selector
bit23: sw done enabled

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Robin Gong<yibin.gong@nxp.com>