MLK-19734-3: dmaengine: imx-sdma: change fifo offset of fifo_num

Multi-fifo scripts will change offset of fifo_num from 8 to 12 for
enlarging the max watermark from 8 to 128, which could utilize more
FIFO space as possible as it can. New 'watermarklevel' defined as
below:

  ;;    bit0~11: wartermark level(wml*fifo_number)
  ;;    bit15~12: fifo number
  ;;    bit16~19: fifo offset
  ;;    bit27~24: sw done selector
  ;;    bit23: sw done enabled

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
(cherry picked from commit 786c8bd56324463cb94ce2c11a83689de0058ca0)
(cherry picked from commit 1432f247a2bcdb38a1b4b5884bf541dfd8fdfcd6)
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
Signed-off-by: Srikanth Krishnakar <Srikanth_Krishnakar@mentor.com>