dmaengine: mic_x100_dma: convert callback to helper function

This is in preperation of moving to a callback that provides results to the
callback for the transaction. The conversion will maintain current behavior
and the driver must convert to new callback mechanism at a later time in
order to receive results.
Signed-off-by: NDave Jiang <dave.jiang@intel.com>
Reviewed-by: NLars-Peter Clausen <lars@metafoo.de>
Cc: Sudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

drivers/dma/mic_x100_dma.c

@@ -104,11 +104,9 @@ static void mic_dma_cleanup(struct mic_dma_chan *ch)
 		tx = &ch->tx_array[last_tail];
 		if (tx->cookie) {
 			dma_cookie_complete(tx);
-			if (tx->callback) {
-				tx->callback(tx->callback_param);
+			dmaengine_desc_get_callback_invoke(tx, NULL);
 			tx->callback = NULL;
 		}
-		}
 		last_tail = mic_dma_hw_ring_inc(last_tail);
 	}
 	/* finish all completion callbacks before incrementing tail */