spi: use dev_get_platdata()

Use the wrapper function for retrieving the platform data instead of
accessing dev->platform_data directly.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index b44a6ac..aa5fc52 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -664,7 +664,7 @@
 static int rspi_request_dma(struct rspi_data *rspi,
 				      struct platform_device *pdev)
 {
-	struct rspi_plat_data *rspi_pd = pdev->dev.platform_data;
+	struct rspi_plat_data *rspi_pd = dev_get_platdata(&pdev->dev);
 	dma_cap_mask_t mask;
 	struct dma_slave_config cfg;
 	int ret;