dmaengine: mediatek: mtk-hsdma: Fix formatting in 'struct mtk_hsdma_pdesc' doc block

Struct attribute names must be an exact match or the kerneldoc checker
gets confused.

Fixes the following W=1 kernel build warning(s):

 drivers/dma/mediatek/mtk-hsdma.c:120: warning: Function parameter or member 'desc1' not described in 'mtk_hsdma_pdesc'
 drivers/dma/mediatek/mtk-hsdma.c:120: warning: Function parameter or member 'desc2' not described in 'mtk_hsdma_pdesc'
 drivers/dma/mediatek/mtk-hsdma.c:120: warning: Function parameter or member 'desc3' not described in 'mtk_hsdma_pdesc'
 drivers/dma/mediatek/mtk-hsdma.c:120: warning: Function parameter or member 'desc4' not described in 'mtk_hsdma_pdesc'
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Cc: Sean Wang <sean.wang@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: linux-mediatek@lists.infradead.org
Link: https://lore.kernel.org/r/20200714111546.1755231-2-lee.jones@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/mediatek/mtk-hsdma.c

@@ -107,10 +107,10 @@ enum mtk_hsdma_vdesc_flag {
  * struct mtk_hsdma_pdesc - This is the struct holding info describing physical
  *			    descriptor (PD) and its placement must be kept at
  *			    4-bytes alignment in little endian order.
- * @desc[1-4]:		    The control pad used to indicate hardware how to
- *			    deal with the descriptor such as source and
- *			    destination address and data length. The maximum
- *			    data length each pdesc can handle is 0x3f80 bytes
+ * @desc1:		    | The control pad used to indicate hardware how to
+ * @desc2:		    | deal with the descriptor such as source and
+ * @desc3:		    | destination address and data length. The maximum
+ * @desc4:		    | data length each pdesc can handle is 0x3f80 bytes
  */
 struct mtk_hsdma_pdesc {
 	__le32 desc1;