dmaengine: axi-dmac: use sg_nents_for_dma() helper

Instead of open coded variant let's use recently introduced helper.

Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20260108105619.3513561-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: andy-shev

drivers/dma/dma-axi-dmac.c

@@ -677,10 +677,7 @@ static struct dma_async_tx_descriptor *axi_dmac_prep_slave_sg(
 	if (direction != chan->direction)
 		return NULL;
 
-	num_sgs = 0;
-	for_each_sg(sgl, sg, sg_len, i)
-		num_sgs += DIV_ROUND_UP(sg_dma_len(sg), chan->max_length);
-
+	num_sgs = sg_nents_for_dma(sgl, sg_len, chan->max_length);
 	desc = axi_dmac_alloc_desc(chan, num_sgs);
 	if (!desc)
 		return NULL;