fsldma: Fix cookie issues

fsl_dma_tx_submit() only sets the cookie on the first descriptor of a
transaction. It should set the cookie on all.

Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Acked-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/dma/fsldma.c

@@ -362,7 +362,7 @@ static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx)
 		if (cookie < 0)
 			cookie = 1;
 
-		desc->async_tx.cookie = cookie;
+		child->async_tx.cookie = cookie;
 	}
 
 	chan->common.cookie = cookie;