dmaengine: axi-dmac: remove use of sg_nents_for_dma()

The discussion around this helper ended up being that it's only a
"band-aid" fix instead of a better API solution that would make this helper
un-needed.
It would have been accepted, but the AXI DMAC would have been the only user
of this, and the benefit of adding this would have been small.

So, this patch removes the use of the helper. Maybe at a later point in
time a good solution would be found.

Signed-off-by: Alexandru Ardelean <[email protected]>

drivers/dma/dma-axi-dmac.c

@@ -585,7 +585,10 @@ static struct dma_async_tx_descriptor *axi_dmac_prep_slave_sg(
 	if (direction != chan->direction)
 		return NULL;
 
-	num_sgs = sg_nents_for_dma(sgl, sg_len, chan->max_length);
+	num_sgs = 0;
+	for_each_sg(sgl, sg, sg_len, i)
+		num_sgs += DIV_ROUND_UP(sg_dma_len(sg), chan->max_length);
+
 	desc = axi_dmac_alloc_desc(num_sgs);
 	if (!desc)
 		return NULL;