spi: tegra20-slink: Use dma_request_chan() directly for channel request

dma_request_slave_channel_reason() is:
#define dma_request_slave_channel_reason(dev, name) \
	dma_request_chan(dev, name)
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: NJon Hunter <jonathanh@nvidia.com>
Link: https://lore.kernel.org/r/20191113094256.1108-10-peter.ujfalusi@ti.comSigned-off-by: NMark Brown <broonie@kernel.org>

drivers/spi/spi-tegra20-slink.c

@@ -599,8 +599,7 @@ static int tegra_slink_init_dma_param(struct tegra_slink_data *tspi,
 	int ret;
 	struct dma_slave_config dma_sconfig;
 
-	dma_chan = dma_request_slave_channel_reason(tspi->dev,
-						dma_to_memory ? "rx" : "tx");
+	dma_chan = dma_request_chan(tspi->dev, dma_to_memory ? "rx" : "tx");
 	if (IS_ERR(dma_chan)) {
 		ret = PTR_ERR(dma_chan);
 		if (ret != -EPROBE_DEFER)