DMA: PL330: allow submitting 2 requests at a time

Fix the logic to allow mc programming of second transfer after first
has been done, by removing immediate return upon success and iterating
until we detect QFull or DMAC dying.
Reported-by: NAlvaro Moran <dirac3000@gmail.com>
Tested-by: NAlvaro Moran <dirac3000@gmail.com>
Signed-off-by: NJassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

drivers/dma/pl330.c

@@ -2288,13 +2288,12 @@ static inline void fill_queue(struct dma_pl330_chan *pch)
 
 		/* If already submitted */
 		if (desc->status == BUSY)
-			break;
+			continue;
 
 		ret = pl330_submit_req(pch->pl330_chid,
 						&desc->req);
 		if (!ret) {
 			desc->status = BUSY;
-			break;
 		} else if (ret == -EAGAIN) {
 			/* QFull or DMAC Dying */
 			break;