dmaengine: xilinx: dpdma: add missing kernel doc

xilinx_dpdma_sw_desc_set_dma_addrs() documentation is missing describing
'xdev', so add it

drivers/dma/xilinx/xilinx_dpdma.c:313: warning: Function parameter or
member 'xdev' not described in 'xilinx_dpdma_sw_desc_set_dma_addrs'

Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Laurent Pinchart <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>

drivers/dma/xilinx/xilinx_dpdma.c

@@ -295,6 +295,7 @@ static inline void dpdma_set(void __iomem *base, u32 offset, u32 set)
 
 /**
  * xilinx_dpdma_sw_desc_set_dma_addrs - Set DMA addresses in the descriptor
+ * @xdev: DPDMA device
  * @sw_desc: The software descriptor in which to set DMA addresses
  * @prev: The previous descriptor
  * @dma_addr: array of dma addresses