dmaengine: pl330: fix the pl330 build after cookie cleanup

drivers/dma/pl330.c: In function 'pl330_control':
drivers/dma/pl330.c:342: error: 'struct dma_pl330_chan' has no member named
'completed'

Reported by: Jassi Brar <jassisinghbrar@gmail.com>
Suggested by: Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

drivers/dma/pl330.c

@@ -339,7 +339,6 @@ static int pl330_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned
 		/* Mark all desc done */
 		list_for_each_entry_safe(desc, _dt, &pch->work_list , node) {
 			desc->status = DONE;
-			pch->completed = desc->txd.cookie;
 			list_move_tail(&desc->node, &list);
 		}