dmaengine: k3dma: 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>
Link: https://patch.msgid.link/20260108105619.3513561-7-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: andy-shev

drivers/dma/k3dma.c

@@ -536,19 +536,14 @@ static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg(
 	size_t len, avail, total = 0;
 	struct scatterlist *sg;
 	dma_addr_t addr, src = 0, dst = 0;
-	int num = sglen, i;
+	int num, i;
 
 	if (sgl == NULL)
 		return NULL;
 
 	c->cyclic = 0;
 
-	for_each_sg(sgl, sg, sglen, i) {
-		avail = sg_dma_len(sg);
-		if (avail > DMA_MAX_SIZE)
-			num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
-	}
-
+	num = sg_nents_for_dma(sgl, sglen, DMA_MAX_SIZE);
 	ds = k3_dma_alloc_desc_resource(num, chan);
 	if (!ds)
 		return NULL;