MLK-18449: dmaengine: imx-sdma：add sw_done support

Add new cell for sw_done/sw_done_selector, because PDM need enable
software done feature in sdma script.
The new fourth cell defined as below:
	Bit31: sw_done
	Bit15~bit0: selector
For example: 0x80000000 means sw_done enabled for done0 sector which
is for PDM on i.mx8mm.

TODO: checkpatch warnings

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
Signed-off-by: Srikanth Krishnakar <Srikanth_Krishnakar@mentor.com>