dmaengine: xilinx_dma: Remove residue from channel data

There is no use of storing channel data residue field. So clean it up.
In tx_status simply pass calculated residue to dma_set_residue.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1571150904-3988-4-git-send-email-radhey.shyam.pandey@xilinx.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/xilinx/xilinx_dma.c

@@ -336,7 +336,6 @@ struct xilinx_dma_tx_descriptor {
  * @desc_pendingcount: Descriptor pending count
  * @ext_addr: Indicates 64 bit addressing is supported by dma channel
  * @desc_submitcount: Descriptor h/w submitted count
- * @residue: Residue for AXI DMA
  * @seg_v: Statically allocated segments base
  * @seg_p: Physical allocated segments base
  * @cyclic_seg_v: Statically allocated segment base for cyclic transfers
@@ -373,7 +372,6 @@ struct xilinx_dma_chan {
 	u32 desc_pendingcount;
 	bool ext_addr;
 	u32 desc_submitcount;
-	u32 residue;
 	struct xilinx_axidma_tx_segment *seg_v;
 	dma_addr_t seg_p;
 	struct xilinx_axidma_tx_segment *cyclic_seg_v;
@@ -1019,8 +1017,7 @@ static enum dma_status xilinx_dma_tx_status(struct dma_chan *dchan,
 		}
 		spin_unlock_irqrestore(&chan->lock, flags);
 
-		chan->residue = residue;
-		dma_set_residue(txstate, chan->residue);
+		dma_set_residue(txstate, residue);
 	}
 
 	return ret;